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nvme: fix misaccounting of nvme-mpath inflight I/O

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[ Upstream commit 71257925e83eae1cb6913d65ca71927d2220e6d1 ]

Procedures for nvme-mpath IO accounting:

 1) initialize nvme_request and clear flags;
 2) set NVME_MPATH_IO_STATS and increase inflight counter when IO
    started;
 3) check NVME_MPATH_IO_STATS and decrease inflight counter when IO is
    done;

However, for the case nvme_fail_nonready_command(), both step 1) and 2)
are skipped, and if old nvme_request set NVME_MPATH_IO_STATS and then
request is reused, step 3) will still be executed, causing inflight I/O
counter to be negative.

Fix the problem by clearing nvme_request in nvme_fail_nonready_command().

Fixes: ea5e5f42cd ("nvme-fabrics: avoid double completions in nvmf_fail_nonready_command")
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Closes: https://lore.kernel.org/all/CAHj4cs_+dauobyYyP805t33WMJVzOWj=7+51p4_j9rA63D9sog@mail.gmail.com/
Signed-off-by: Yu Kuai <yukuai3@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yu Kuai
2025-07-15 09:28:12 +08:00
committed by Greg Kroah-Hartman
parent ec158d05ea
commit a2f02a87fe
1 changed files with 4 additions and 0 deletions
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4
drivers/nvme/host/core.c
View File

@@ -689,6 +689,10 @@ blk_status_t nvme_fail_nonready_command(struct nvme_ctrl *ctrl,
!test_bit(NVME_CTRL_FAILFAST_EXPIRED, &ctrl->flags) &&
!blk_noretry_request(rq) && !(rq->cmd_flags & REQ_NVME_MPATH))
return BLK_STS_RESOURCE;
if (!(rq->rq_flags & RQF_DONTPREP))
nvme_clear_nvme_request(rq);
return nvme_host_path_error(rq);
}
EXPORT_SYMBOL_GPL(nvme_fail_nonready_command);