From: "Martin K. Petersen" <martin.petersen@oracle.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Keith Busch <keith.busch@intel.com>,
Sagi Grimberg <sagi@grimberg.me>, Jens Axboe <axboe@kernel.dk>,
Hannes Reinecke <hare@suse.de>,
Johannes Thumshirn <jthumshirn@suse.de>,
linux-nvme@lists.infradead.org, linux-block@vger.kernel.org
Subject: Re: [PATCH 3/7] nvme: track shared namespaces
Date: Thu, 09 Nov 2017 15:28:13 -0500 [thread overview]
Message-ID: <yq18tffw61u.fsf@oracle.com> (raw)
In-Reply-To: <20171109174450.17142-4-hch@lst.de> (Christoph Hellwig's message of "Thu, 9 Nov 2017 18:44:46 +0100")
Christoph,
> Introduce a new struct nvme_ns_head that holds information about an
> actual namespace, unlike struct nvme_ns, which only holds the
> per-controller namespace information. For private namespaces there is
> a 1:1 relation of the two, but for shared namespaces this lets us
> discover all the paths to it. For now only the identifiers are moved
> to the new structure, but most of the information in struct nvme_ns
> should eventually move over.
>
> To allow lockless path lookup the list of nvme_ns structures per
> nvme_ns_head is protected by SRCU, which requires freeing the nvme_ns
> structure through call_srcu.
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
--
Martin K. Petersen Oracle Linux Engineering
WARNING: multiple messages have this Message-ID (diff)
From: martin.petersen@oracle.com (Martin K. Petersen)
Subject: [PATCH 3/7] nvme: track shared namespaces
Date: Thu, 09 Nov 2017 15:28:13 -0500 [thread overview]
Message-ID: <yq18tffw61u.fsf@oracle.com> (raw)
In-Reply-To: <20171109174450.17142-4-hch@lst.de> (Christoph Hellwig's message of "Thu, 9 Nov 2017 18:44:46 +0100")
Christoph,
> Introduce a new struct nvme_ns_head that holds information about an
> actual namespace, unlike struct nvme_ns, which only holds the
> per-controller namespace information. For private namespaces there is
> a 1:1 relation of the two, but for shared namespaces this lets us
> discover all the paths to it. For now only the identifiers are moved
> to the new structure, but most of the information in struct nvme_ns
> should eventually move over.
>
> To allow lockless path lookup the list of nvme_ns structures per
> nvme_ns_head is protected by SRCU, which requires freeing the nvme_ns
> structure through call_srcu.
Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>
--
Martin K. Petersen Oracle Linux Engineering
next prev parent reply other threads:[~2017-11-09 20:28 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-09 17:44 nvme multipath support V7 Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 17:44 ` [PATCH 1/7] nvme: track subsystems Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 20:23 ` Martin K. Petersen
2017-11-09 20:23 ` Martin K. Petersen
2017-11-09 17:44 ` [PATCH 2/7] nvme: introduce a nvme_ns_ids structure Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 20:25 ` Martin K. Petersen
2017-11-09 20:25 ` Martin K. Petersen
2017-11-09 17:44 ` [PATCH 3/7] nvme: track shared namespaces Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 20:28 ` Martin K. Petersen [this message]
2017-11-09 20:28 ` Martin K. Petersen
2017-11-09 17:44 ` [PATCH 4/7] nvme: implement multipath access to nvme subsystems Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 18:17 ` Keith Busch
2017-11-09 18:17 ` Keith Busch
2017-11-09 20:32 ` Martin K. Petersen
2017-11-09 20:32 ` Martin K. Petersen
2017-11-09 21:21 ` Keith Busch
2017-11-09 21:21 ` Keith Busch
2017-11-10 4:52 ` Christoph Hellwig
2017-11-10 4:52 ` Christoph Hellwig
2017-11-10 5:07 ` Christoph Hellwig
2017-11-10 5:07 ` Christoph Hellwig
2017-11-09 21:22 ` Mike Snitzer
2017-11-09 21:22 ` Mike Snitzer
2017-11-10 4:54 ` Christoph Hellwig
2017-11-10 4:54 ` Christoph Hellwig
2017-11-10 7:27 ` Hannes Reinecke
2017-11-10 7:27 ` Hannes Reinecke
2017-11-09 17:44 ` [PATCH 5/7] nvme: also expose the namespace identification sysfs files for mpath nodes Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 20:33 ` Martin K. Petersen
2017-11-09 20:33 ` Martin K. Petersen
2017-11-10 8:21 ` Hannes Reinecke
2017-11-10 8:21 ` Hannes Reinecke
2017-11-09 17:44 ` [PATCH 6/7] block: create 'slaves' and 'holders' entries for hidden gendisks Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 20:34 ` Martin K. Petersen
2017-11-09 20:34 ` Martin K. Petersen
2017-11-09 17:44 ` [PATCH 7/7] nvme: create 'slaves' and 'holders' entries for hidden controllers Christoph Hellwig
2017-11-09 17:44 ` Christoph Hellwig
2017-11-09 20:34 ` Martin K. Petersen
2017-11-09 20:34 ` Martin K. Petersen
2017-11-10 8:44 ` nvme multipath support V7 Christoph Hellwig
2017-11-10 8:44 ` Christoph Hellwig
2018-04-10 19:32 ` Gruher, Joseph R
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