From: Sagi Grimberg <sagi@grimberg.me>
To: Hannes Reinecke <hare@suse.de>, Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <keith.busch@wdc.com>,
linux-nvme@lists.infradead.org, Keith Busch <kbusch@kernel.org>,
Daniel Wagner <daniel.wagner@suse.de>
Subject: Re: [PATCHv3] nvme-mpath: delete disk after last connection
Date: Fri, 7 May 2021 10:20:17 -0700 [thread overview]
Message-ID: <da9afc01-756b-2e09-b669-2f41cb85a177@grimberg.me> (raw)
In-Reply-To: <4fd33328-9060-6e95-dd26-ab013e44c07a@suse.de>
>>> PCI and fabrics have different defaults; for PCI the device goes away if
>>> the last path (ie the controller) goes away, for fabrics it doesn't
>>> if the
>>> device is mounted.
>>
>> Err, no. For fabrics we reconnect a while, but otherwise the behavior
>> is the same right now.
>>
> No, that is not the case.
>
> When a PCI nvme device with CMIC=0 is removed (via pci hotplug, say),
> the nvme device is completely removed, irrespective on whether it's
> mounted or not.
> When the _same_ PCI device with CMIC=1 is removed, the nvme device (ie
> the nsnhead) will _stay_ when mounted (as the refcount is not zero).
>
> This can be easily demonstrated on qemu; just set the 'subsys' parameter
> for the nvme device.
Perhaps we need to fix the issue and allow the existing behavior by
having an explicit queue_if_no_path argument.
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next prev parent reply other threads:[~2021-05-07 17:20 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-01 12:04 [PATCHv3] nvme-mpath: delete disk after last connection Hannes Reinecke
2021-05-04 8:54 ` Christoph Hellwig
2021-05-04 13:40 ` Hannes Reinecke
2021-05-04 19:54 ` Sagi Grimberg
2021-05-05 15:26 ` Keith Busch
2021-05-05 16:15 ` Hannes Reinecke
2021-05-05 20:40 ` Sagi Grimberg
2021-05-06 2:50 ` Keith Busch
2021-05-06 6:13 ` Hannes Reinecke
2021-05-06 7:43 ` Christoph Hellwig
2021-05-06 8:42 ` Hannes Reinecke
2021-05-06 9:47 ` Sagi Grimberg
2021-05-06 12:08 ` Christoph Hellwig
2021-05-06 15:54 ` Hannes Reinecke
2021-05-07 6:46 ` Christoph Hellwig
2021-05-07 17:02 ` Hannes Reinecke
2021-05-07 17:20 ` Sagi Grimberg [this message]
2021-05-10 6:23 ` Christoph Hellwig
2021-05-10 13:01 ` Hannes Reinecke
2021-05-10 13:57 ` Hannes Reinecke
2021-05-10 14:48 ` Hannes Reinecke
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