From: Anton Eidelman <anton.eidelman@gmail.com>
To: linux-nvme@lists.infradead.org, hch@lst.de, kbusch@kernel.org,
sagi@grimberg.me, axboe@fb.com
Cc: Anton Eidelman <anton@lightbitslabs.com>
Subject: [PATCH 1/3] nvme/multipath: fix failure to update ns ana state
Date: Sun, 12 Sep 2021 12:54:57 -0600 [thread overview]
Message-ID: <20210912185459.13496-2-anton@lightbitslabs.com> (raw)
In-Reply-To: <20210912185459.13496-1-anton@lightbitslabs.com>
nvme_update_ana_state() has a deficiency that results
in failure to update the ana state for a namespace
in the following case:
nsid's in ctrl->namespaces: 1, 3, 4
nsid's in desc->nsids: 1, 2, 3, 4
Loop iteration 0:
ns index = 0, n = 0, ns->head->ns_id = 1, nsid = 1, MATCH.
Loop iteration 1:
ns index = 1, n = 1, ns->head->ns_id = 3, nsid = 2, NO MATCH.
Loop iteration 2:
ns index = 2, n = 2, ns->head->ns_id = 4, nsid = 4, MATCH.
Result: missed nsid=3 and did not update its ana state.
Solution: when ns->head->ns_id is higher than nsid,
increment n and RETRY with the SAME ns.
Signed-off-by: Anton Eidelman <anton@lightbitslabs.com>
---
drivers/nvme/host/multipath.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c
index 5d7bc58a27bd..e8ccdd398f78 100644
--- a/drivers/nvme/host/multipath.c
+++ b/drivers/nvme/host/multipath.c
@@ -600,14 +600,17 @@ static int nvme_update_ana_state(struct nvme_ctrl *ctrl,
down_read(&ctrl->namespaces_rwsem);
list_for_each_entry(ns, &ctrl->namespaces, list) {
- unsigned nsid = le32_to_cpu(desc->nsids[n]);
-
+ unsigned nsid;
+again:
+ nsid = le32_to_cpu(desc->nsids[n]);
if (ns->head->ns_id < nsid)
continue;
if (ns->head->ns_id == nsid)
nvme_update_ns_ana_state(desc, ns);
if (++n == nr_nsids)
break;
+ if (ns->head->ns_id > nsid)
+ goto again;
}
up_read(&ctrl->namespaces_rwsem);
return 0;
--
2.25.1
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next prev parent reply other threads:[~2021-09-12 18:55 UTC|newest]
Thread overview: 36+ 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 ` Anton Eidelman [this message]
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
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
-- strict thread matches above, loose matches on Subject: below --
2021-09-12 1:07 [PATCH 0/3] nvme/mpath: fix missed namespaces in ana state update Anton Eidelman
2021-09-12 1:07 ` [PATCH 1/3] nvme/multipath: fix failure to update ns ana state Anton Eidelman
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