On Sat, Feb 10, 2024 at 12:27:33AM +0100, Martin Wilck wrote:
> For all "spurious" events, which includes coldplug events,
> DM_DISABLE_OTHER_RULES_FLAG will be read from the udev DB in
> 10-dm.rules. Thus if a previous event saw the device in suspended
> state, the flag will be set even if the device has meanwhile
> resumed. Reset the flag if none of the conditions hold that
> would cause it to be set in a genuine uevent in 10-dm.rules.
>
> It would be cleaner to do this in 10-dm.rules directly, but it
> cannot be done easily, because the flag can also have an origin
> inside lvm itself; lvm sets it for various kinds of logical
> volumes. For generic (non-LVM) dm devices, the flag is only set
> in 10-dm.rules though, so doing this is safe for multipath.
>
> Signed-off-by: Martin Wilck <mwilck@xxxxxxxx>
Reviewed-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
> ---
> multipath/11-dm-mpath.rules.in | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/multipath/11-dm-mpath.rules.in b/multipath/11-dm-mpath.rules.in
> index e31107b..8e8741a 100644
> --- a/multipath/11-dm-mpath.rules.in
> +++ b/multipath/11-dm-mpath.rules.in
> @@ -9,6 +9,13 @@ ACTION=="add", ENV{DM_ACTIVATION}=="1", ENV{DM_SUSPENDED}=="1", \
> PROGRAM="/bin/logger -t 11-dm-mpath.rules -p daemon.warning \"Coldplug event for suspended device\"", \
> ENV{DM_COLDPLUG_SUSPENDED}="1", GOTO="scan_import"
>
> +# Coldplug event. DM_UDEV_DISABLE_OTHER_RULES_FLAG has been restored
> +# from DB in 10-dm.rules. If the device is not suspended, clear the flag.
> +# This is safe for multipath where DM_UDEV_DISABLE_OTHER_RULES_FLAG is basically
> +# equivalent to DM_SUSPENDED==1 || DISK_RO==1
> +ACTION=="add", ENV{DM_ACTIVATION}=="1", ENV{DM_SUSPENDED}!="1", ENV{DISK_RO}!="1", \
> + ENV{DM_UDEV_DISABLE_OTHER_RULES_FLAG}="", GOTO="scan_import"
> +
> # If this uevent didn't come from dm, don't try to update the
> # device state
> ENV{DM_COOKIE}!="?*", ENV{DM_ACTION}!="PATH_*", IMPORT{db}="DM_NOSCAN", GOTO="scan_import"
> --
> 2.43.0
