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a/tests/nvme/068 b/tests/nvme/068 >> new file mode 100644 >> index 0000000..e06fd6b >> --- /dev/null >> +++ b/tests/nvme/068 >> @@ -0,0 +1,118 @@ >> +#!/bin/bash >> +# SPDX-License-Identifier: GPL-3.0+ >> +# Copyright (C) 2026 John Garry >> +# >> +# Test NVMe multipath delayed removal works as expected >> + > Should we also reference the commit 62188639ec16 ("nvme-multipath: > introduce delayed removal of the multipath head node") which introduced > this feature in the kernel? > Sure, if you think that it is useful. We could also introduce at some point the _fixed_by_kernel_commit (like xfstests), but I am not sure if it has value for blktests >> +. tests/nvme/rc >> +. common/xfs >> + >> +DESCRIPTION="NVMe multipath delayed removal test" >> +QUICK=1 >> + >> +requires() { >> +    _nvme_requires >> +    _have_loop >> +    _have_module_param_value nvme_core multipath Y >> +    _require_nvme_trtype_is_fabrics >> +} >> + >> +set_conditions() { >> +    _set_nvme_trtype "$@" >> +} >> + >> +_delayed_nvme_reconnect_ctrl() { >> +    sleep 5 >> +    _nvme_connect_subsys >> +} >> + >> +test() { >> +    echo "Running ${TEST_NAME}" >> + >> +    _setup_nvmet >> + >> +    local nvmedev >> +    local ns >> +    local bytes_written >> +    local refcnt_orig >> +    local refcnt >> +    _nvmet_target_setup >> + >> +    _nvme_connect_subsys >> + >> +    # Part a: Prove that writes fail when no path returns. Any reads or >> +    #      writes are queued during the delayed removal period. If no >> +    #      paths return before the timer expires, then those IOs should >> +    #      fail. >> +    #      During the delayed removal period, ensure that the module >> +    #      refcnt is incremented, to prove that we cannot remove the >> +    #      driver during this period. >> +    nvmedev=$(_find_nvme_dev "${def_subsysnqn}") >> +    ns=$(_find_nvme_ns "${def_subsys_uuid}") >> +    refcnt=$(_module_use_count nvme_core) > > Should the refcount be stored in $refcnt_orig instead of $refcnt? Yeah, that's a small bug, as I needlessly store it twice: + refcnt=$(_module_use_count nvme_core) + echo 10 > "/sys/block/"$ns"/delayed_removal_secs" + refcnt_orig=$(_module_use_count nvme_core) > >> +    echo 10 > "/sys/block/"$ns"/delayed_removal_secs" >> +    refcnt_orig=$(_module_use_count nvme_core) > > We may not need to again store refcnt here if we store it > before enabling delayed_removal_sec above. > > Other than above trivial comments, this looks good to me. > Cheers, John