Subject: Re: UBC status
To: Manuel Bouyer <firstname.lastname@example.org>
From: Jason Thorpe <email@example.com>
Date: 09/26/1999 11:16:15
On Sun, 26 Sep 1999 16:42:05 +0200
Manuel Bouyer <firstname.lastname@example.org> wrote:
> This could also help with tagget command queuing, where tagged commands need
> to have some ordering information to keep filesystem consistency.
...this is a whole other discussion, but...
Solaris has a B_ORDERED flag which is a hint specifically for this type
Basically, metadata writes (and any other writes that need to be ordered)
would set B_ORDERED, and this would affect disksort() (for disks which
don't supported tagged commands) and the type of tag used (for disks that do).
A B_URGENT (Head-Of-Queue tag) flag might also be useful.
-- Jason R. Thorpe <email@example.com>