From: Christoph Hellwig <hch@lst.de>
To: Sagi Grimberg <sagi@grimberg.me>
Cc: Christoph Hellwig <hch@lst.de>, Keith Busch <kbusch@kernel.org>,
Anton Eidelman <anton.eidelman@gmail.com>,
linux-nvme@lists.infradead.org, axboe@fb.com,
Anton Eidelman <anton@lightbitslabs.com>,
Chaitanya Kulkarni <kch@nvidia.com>
Subject: Re: [PATCH v2 3/3] nvme/multipath: fix stale ana state for namespaces just added by scan work
Date: Tue, 14 Sep 2021 09:32:36 +0200 [thread overview]
Message-ID: <20210914073236.GA458@lst.de> (raw)
In-Reply-To: <e65e9c83-33ed-df58-0eed-4ecf9cb4485f@grimberg.me>
On Tue, Sep 14, 2021 at 10:09:43AM +0300, Sagi Grimberg wrote:
>
>>> I agree it should not happen with xarray as inserts preserve sorting,
>>> but that patch has the non-trivial removal of the namespaces_rwsem which
>>> synchronizes in a lot in a lot of error recovery flows. It's very
>>> possible that xarray will introduce regressions.
>>
>> I've actually started looking over the series earlier today, and staring
>> it I'm pretty sure the namespaces_rwsem is completely broken. There
>> is nothing preventing the namespaces from going away in these loops.
>
> Where? the ns itself? the ns is removed from ctrl->namespaces list under
> this rwsem (nvme_ns_remove).
Sorry, with the series I meant the xarray conversion that removes the
rwsem entirely.
>> But I can't see why we don't just always do a sorted insertation into
>> the ->namespaces list. Just trying to figure out the history of the
>> delayed sort ATM.
>
> Don't know the history.
git-blame teels me it showed up with the initial ID ns list support
from Keith, so not all that much history here.
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next prev parent reply other threads:[~2021-09-14 7:33 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-12 18:54 [PATCH RESEND 0/3] nvme/mpath: fix missed namespaces in ana state update Anton Eidelman
2021-09-12 18:54 ` [PATCH 1/3] nvme/multipath: fix failure to update ns ana state Anton Eidelman
2021-09-12 18:54 ` [PATCH 2/3] nvme/multipath: cosmetic: keep ns nsid locally Anton Eidelman
2021-09-12 18:54 ` [PATCH 3/3] nvme/multipath: fix stale ana state for namespaces just added by scan work Anton Eidelman
2021-09-13 15:30 ` [PATCH v2 0/3] nvme/mpath: fix missed namespaces in ana state update Anton Eidelman
2021-09-13 15:30 ` [PATCH v2 1/3] nvme/multipath: fix failure to update ns ana state Anton Eidelman
2021-09-13 16:01 ` Christoph Hellwig
2021-09-13 19:29 ` Sagi Grimberg
2021-09-14 8:27 ` Christoph Hellwig
2021-09-13 15:30 ` [PATCH v2 2/3] nvme/multipath: cosmetic: keep ns nsid locally Anton Eidelman
2021-09-13 16:02 ` Christoph Hellwig
2021-09-13 20:19 ` Anton Eidelman
2021-09-13 20:57 ` Keith Busch
2021-09-14 5:44 ` Christoph Hellwig
2021-09-13 15:30 ` [PATCH v2 3/3] nvme/multipath: fix stale ana state for namespaces just added by scan work Anton Eidelman
2021-09-13 16:03 ` Christoph Hellwig
2021-09-13 16:08 ` Keith Busch
2021-09-14 6:24 ` Sagi Grimberg
2021-09-14 6:30 ` Christoph Hellwig
2021-09-14 6:40 ` Christoph Hellwig
2021-09-14 7:09 ` Sagi Grimberg
2021-09-14 7:32 ` Christoph Hellwig [this message]
2021-09-14 16:45 ` Anton Eidelman
2021-09-15 9:32 ` Sagi Grimberg
2021-09-14 14:24 ` Keith Busch
2021-09-13 16:07 ` Keith Busch
2021-09-13 16:11 ` Christoph Hellwig
2021-09-13 16:24 ` Keith Busch
2021-09-13 16:46 ` Anton Eidelman
2021-09-13 15:32 ` [PATCH v2 0/3] nvme/mpath: fix missed namespaces in ana state update Christoph Hellwig
2021-09-13 15:42 ` [PATCH v2 0/3] nvme/mpath: fix missed namespaces in ana state update FIXED Anton Eidelman
2021-09-13 21:46 ` [PATCH v3 0/3] nvme/mpath: fix missed namespaces in ana state update Anton Eidelman
2021-09-13 21:46 ` [PATCH v3 1/3] nvme/multipath: fix failure to update ns ana state Anton Eidelman
2021-09-13 21:46 ` [PATCH v3 2/3] nvme/multipath: cosmetic: keep ns nsid locally Anton Eidelman
2021-09-13 21:46 ` [PATCH v3 3/3] nvme/multipath: fix stale ana state for namespaces just added by scan work Anton Eidelman
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