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Message-ID: <d2a7fa68-1890-4367-a2ac-59ec220779bd@suse.de> Date: Tue, 13 May 2025 08:32:12 +0200 From: Hannes Reinecke <hare@...e.de> To: Christoph Hellwig <hch@...radead.org> Cc: Kevin Wolf <kwolf@...hat.com>, Martin Wilck <mwilck@...e.com>, dm-devel@...ts.linux.dev, hreitz@...hat.com, mpatocka@...hat.com, snitzer@...nel.org, bmarzins@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/2] dm mpath: Interface for explicit probing of active paths On 5/13/25 08:14, Christoph Hellwig wrote: > On Tue, May 13, 2025 at 08:09:45AM +0200, Hannes Reinecke wrote: >> On 5/13/25 07:55, Christoph Hellwig wrote: >>> On Mon, May 12, 2025 at 05:18:43PM +0200, Kevin Wolf wrote: >>>> Yes, it's a bit unfortunate, but we have to work with what we have. QEMU >>>> doesn't even necessarily know that it's dealing with a multipath device, >>>> so it just has to blindly try the ioctl and see if it works. >>> >>> Why is qemu even using SG_IO to start with? >>> >> To be able to forward SCSI commands. > > Why? > Reservations and stuff. There are customer who use GPFS ... But yes, I know. We are working on it; it should be possible to hook in the generic block reservation code here. Cheers, Hannes -- Dr. Hannes Reinecke Kernel Storage Architect hare@...e.de +49 911 74053 688 SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich
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