Re: [PATCH] fstests: update patien module remover usage

From: Zorro Lang
Date: Sun Dec 25 2022 - 08:48:54 EST

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On Tue, Dec 20, 2022 at 04:29:22PM -0800, Luis Chamberlain wrote:
> kmod now has support for the patient module remover but
> it uses --wait instead of -p, and it does not have an option
> to wait forever. So let's just deprecate the "forever" option,
> and use update our code to use --wait.
>
> Since blktests is also getting support, and since they actually
> use 'make check' with consistent shellcheck checks, embrace the
> implementation there so we at least match solutions. That way if
> there are bugs in one we can fix them in the other project as well.
> The style changes are minor.
>
> A few functional changes brought forward from the solution embraced
> by blktests
>
> * sanity check for the modules sysfs directory to replace "-" with
> "_" and document why we do that
> * do not run if the module does not exist or is not loaded, that's
> the addition of:
> [ ! -e "/sys/module/$module_sys" ] && return 0
>
> Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
> ---
>
> Although the blktests patch is not yet merged its on its v3 now.
> I *have not tested* this patch yet on fstests... once I do I'll
> poke back here.
>
> README | 3 +--
> common/config | 31 +++++++++++++++++++------------
> common/module | 28 ++++++++++++----------------
> 3 files changed, 32 insertions(+), 30 deletions(-)
>
> diff --git a/README b/README
> index 4c4f22f853de..b2d4744593f3 100644
> --- a/README
> +++ b/README
> @@ -222,8 +222,7 @@ Kernel/Modules related configuration:
> test invocations. This assumes that the name of the module is the same
> as FSTYP.
> - Set MODPROBE_PATIENT_RM_TIMEOUT_SECONDS to specify the amount of time we
> - should try a patient module remove. The default is 50 seconds. Set this
> - to "forever" and we'll wait forever until the module is gone.
> + should try a patient module remove. The default is 50 seconds.
> - Set KCONFIG_PATH to specify your preferred location of kernel config
> file. The config is used by tests to check if kernel feature is enabled.
>
> diff --git a/common/config b/common/config
> index b2802e5e0af1..8bc6b3d2ae3f 100644
> --- a/common/config
> +++ b/common/config
> @@ -256,11 +256,15 @@ if [[ "$UDEV_SETTLE_PROG" == "" || ! -d /proc/net ]]; then
> fi
> export UDEV_SETTLE_PROG
>
> -# Set MODPROBE_PATIENT_RM_TIMEOUT_SECONDS to "forever" if you want the patient
> -# modprobe removal to run forever trying to remove a module.
> +_has_modprobe_patient()
> +{
> + modprobe --help >& /dev/null || return 1
> + modprobe --help | grep -q "\-\-wait" || return 1
^^^^

This might cause error output from grep, better to use "--", e.g:

grep -q -- "--wait"

> + return 0
> +}
> +
> MODPROBE_REMOVE_PATIENT=""
> -modprobe --help >& /dev/null && modprobe --help | grep -q -1 "remove-patiently"
> -if [[ $? -ne 0 ]]; then
> +if ! _has_modprobe_patient; then
> if [[ -z "$MODPROBE_PATIENT_RM_TIMEOUT_SECONDS" ]]; then
> # We will open code our own implementation of patient module
> # remover in fstests. Use a 50 second default.
> @@ -268,22 +272,25 @@ if [[ $? -ne 0 ]]; then
> fi
> else
> MODPROBE_RM_PATIENT_TIMEOUT_ARGS=""
> - if [[ ! -z "$MODPROBE_PATIENT_RM_TIMEOUT_SECONDS" ]]; then
> - if [[ "$MODPROBE_PATIENT_RM_TIMEOUT_SECONDS" != "forever" ]]; then
> - MODPROBE_PATIENT_RM_TIMEOUT_MS="$((MODPROBE_PATIENT_RM_TIMEOUT_SECONDS * 1000))"
> - MODPROBE_RM_PATIENT_TIMEOUT_ARGS="-t $MODPROBE_PATIENT_RM_TIMEOUT_MS"
> + if [[ -n "$MODPROBE_PATIENT_RM_TIMEOUT_SECONDS" ]]; then
> + MODPROBE_PATIENT_RM_TIMEOUT_MS="$((MODPROBE_PATIENT_RM_TIMEOUT_SECONDS * 1000))"
> + MODPROBE_RM_PATIENT_TIMEOUT_ARGS="--wait $MODPROBE_PATIENT_RM_TIMEOUT_MS"
> + if [[ "$MODPROBE_PATIENT_RM_TIMEOUT_SECONDS" == "forever" ]];

"then" missed.

Others make sense to me. Better to give it a basic test, to make sure it works :)

Thanks,
Zorro

> + echo "Warning: deprecated MODPROBE_PATIENT_RM_TIMEOUT_SECONDS forever setting"
> + echo "Just set this to a high value if you want this to linger for a long time"
> + exit 1
> fi
> else
> # We export MODPROBE_PATIENT_RM_TIMEOUT_SECONDS here for parity
> - # with environments without support for modprobe -p, but we
> + # with environments without support for modprobe --wait, but we
> # only really need it exported right now for environments which
> - # don't have support for modprobe -p to implement our own
> + # don't have support for modprobe --wait to implement our own
> # patient module removal support within fstests.
> export MODPROBE_PATIENT_RM_TIMEOUT_SECONDS="50"
> MODPROBE_PATIENT_RM_TIMEOUT_MS="$((MODPROBE_PATIENT_RM_TIMEOUT_SECONDS * 1000))"
> - MODPROBE_RM_PATIENT_TIMEOUT_ARGS="-t $MODPROBE_PATIENT_RM_TIMEOUT_MS"
> + MODPROBE_RM_PATIENT_TIMEOUT_ARGS="--wait $MODPROBE_PATIENT_RM_TIMEOUT_MS"
> fi
> - MODPROBE_REMOVE_PATIENT="modprobe -p $MODPROBE_RM_PATIENT_TIMEOUT_ARGS"
> + MODPROBE_REMOVE_PATIENT="modprobe -r $MODPROBE_RM_PATIENT_TIMEOUT_ARGS"
> fi
> export MODPROBE_REMOVE_PATIENT
>
> diff --git a/common/module b/common/module
> index 6efab71d348e..bd205dafeaff 100644
> --- a/common/module
> +++ b/common/module
> @@ -107,9 +107,9 @@ _patient_rmmod_check_refcnt()
> # MODPROBE_PATIENT_RM_TIMEOUT_SECONDS prior to including this file.
> # If you want this to try forever just set MODPROBE_PATIENT_RM_TIMEOUT_SECONDS
> # to the special value of "forever". This applies to both cases where kmod
> -# supports the patient module remover (modrobe -p) and where it does not.
> +# supports the patient module remover (modrobe --wait) and where it does not.
> #
> -# If your version of kmod supports modprobe -p, we instead use that
> +# If your version of kmod supports modprobe --wait, we instead use that
> # instead. Otherwise we have to implement a patient module remover
> # ourselves.
> _patient_rmmod()
> @@ -119,6 +119,12 @@ _patient_rmmod()
> local max_tries=0
> local mod_ret=0
> local refcnt_is_zero=0
> + # Since we are looking for a directory we must adopt the
> + # specific directory used by scripts/Makefile.lib for
> + # KBUILD_MODNAME
> + local module_sys=${module//-/_}
> +
> + [ ! -e "/sys/module/$module_sys" ] && return 0
>
> if [[ ! -z $MODPROBE_REMOVE_PATIENT ]]; then
> $MODPROBE_REMOVE_PATIENT $module
> @@ -131,20 +137,13 @@ _patient_rmmod()
>
> max_tries=$max_tries_max
>
> - # We must use a string check as otherwise if max_tries is set to
> - # "forever" and we don't use a string check we can end up skipping
> - # entering this loop.
> while [[ "$max_tries" != "0" ]]; do
> - _patient_rmmod_check_refcnt $module
> - if [[ $? -eq 0 ]]; then
> + if _patient_rmmod_check_refcnt "$module_sys"; then
> refcnt_is_zero=1
> break
> fi
> sleep 1
> - if [[ "$max_tries" == "forever" ]]; then
> - continue
> - fi
> - let max_tries=$max_tries-1
> + ((max_tries--))
> done
>
> if [[ $refcnt_is_zero -ne 1 ]]; then
> @@ -169,17 +168,14 @@ _patient_rmmod()
> # https://bugzilla.kernel.org/show_bug.cgi?id=212337
> # https://bugzilla.kernel.org/show_bug.cgi?id=214015
> while [[ $max_tries != 0 ]]; do
> - if [[ -d /sys/module/$module ]]; then
> + if [[ -d /sys/module/$module_sys ]]; then
> modprobe -r $module 2> /dev/null
> mod_ret=$?
> if [[ $mod_ret == 0 ]]; then
> break;
> fi
> sleep 1
> - if [[ "$max_tries" == "forever" ]]; then
> - continue
> - fi
> - let max_tries=$max_tries-1
> + ((max_tries--))
> else
> break
> fi
> --
> 2.35.1
>

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