Date: Thu, 15 Jul 2010 14:10:02 GMT From: Marcin Wisnicki <mwisnicki+freebsd@gmail.com> To: freebsd-geom@FreeBSD.org Subject: Re: kern/148540: [geom] geom_sched breaks ata devices Message-ID: <201007151410.o6FEA2J0040049@freefall.freebsd.org>
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The following reply was made to PR kern/148540; it has been noted by GNATS. From: Marcin Wisnicki <mwisnicki+freebsd@gmail.com> To: "Andrey V. Elsukov" <bu7cher@yandex.ru> Cc: bug-followup@freebsd.org, "Anton A. Barsukov" <iscsi@zesdid.com>, Luigi Rizzo <luigi@freebsd.org> Subject: Re: kern/148540: [geom] geom_sched breaks ata devices Date: Thu, 15 Jul 2010 16:06:01 +0200 On Wed, Jul 14, 2010 at 16:32, Marcin Wisnicki <mwisnicki+freebsd@gmail.com> wrote: > 2010/7/14 Andrey V. Elsukov <bu7cher@yandex.ru>: >> Hi, >> >> can you test attached patch? >> > > Forwarding ioctls works but I'm thinking that maybe gsched should > insert itself as a sibling to DEV and reattach all non-DEV consumers > (though that would mean you could bypass scheduler by directly opening > device). > Something like this: > http://wisnia21.freeshell.org/f/freebsd/geom_sched-insertion.png > One more thing. Currently gsched messes up names of disk geoms; # geom disk status Name Status Components ad0.sched. N/A N/A ad1 N/A N/A cd0 N/A N/A da0 N/A N/A da1 N/A N/A # sysctl -b kern.geom.conftxt | grep -a DISK 0 DISK da1 4060086272 512 hd 255 sc 63 0 DISK da0 1000204886016 512 hd 255 sc 63 0 DISK cd0 0 2048 hd 0 sc 0 0 DISK ad1 120034123776 512 hd 16 sc 255 0 DISK ad0.sched. 41109061120 512 hd 16 sc 255 Besides not looking good it breaks tools that use this information (like causing sade and sysinstall to segfault). Or maybe it is a bug of geom(8)-status and kern.geom.conftxt ? It seems like they print name of geom provider instead of the name of geom. ghost# geom disk status ad0 Name Status Components ad0.sched. N/A N/A ghost# geom disk status ad0.sched. geom: No such geom: ad0.sched.. ghost# geom disk list ad0.sched. geom: No such geom: ad0.sched.. ghost# geom disk list ad0 Geom name: ad0 Providers: 1. Name: ad0.sched. Mediasize: 41109061120 (38G) Sectorsize: 512 Mode: r7w7e21 fwsectors: 255 fwheads: 16
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