No udev ID_FS_TYPE field for AFD/ASM disk on Oracle Real Application Clusters (RAC) 19c.

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Environment

Oracle Real Application Clusters (RAC) 19c
SUSE Linux Enterprise Server 15SP3

Situation

Disks claimed by Oracle ASM/AFD drivers will not have ID_FS_TYPE and other ID_FS_XXX fields defined in their udev information.
my-server:~ # udevadm info /dev/dm-1
P: /devices/virtual/block/dm-1
N: dm-1
L: 50
S: mapper/360000180000314900035644040445556
S: disk/by-id/wwn-0x60000180000314900035644040445556
S: disk/by-id/scsi-360000180000314900035644040445556
E: DEVPATH=/devices/virtual/block/dm-1
E: DEVNAME=/dev/dm-1
E: DEVTYPE=disk
E: MAJOR=254
E: MINOR=1
E: SUBSYSTEM=block
E: USEC_INITIALIZED=15550000
E: DM_UDEV_DISABLE_SUBSYSTEM_RULES_FLAG=1
E: DM_UDEV_DISABLE_DISK_RULES_FLAG=1
E: DM_UDEV_DISABLE_OTHER_RULES_FLAG=1
E: DM_NAME=360000180000314900035644040445556
E: DM_UUID=mpath-360000180000314900035644040445556
E: DM_SUSPENDED=0
E: DM_UDEV_RULES_VSN=2
E: MPATH_SBIN_PATH=/sbin
E: MPATH_DEVICE_READY=1
E: DM_TYPE=scsi
E: DM_WWN=0x60000180000314900035644040445556
E: DM_SERIAL=360000180000314900035644040445556
E: DIGITAL_ARRAY=PMAXHP
E: DIGITAL_DEVNAME=PMAXHP_445556
E: DEVLINKS=/dev/mapper/360000180000314900035644040445556 /dev/disk/by-id/wwn-0x60000180000314900035644040445556 /dev/disk/by-id/scsi-360000180000314900035644040445556
E: TAGS=:systemd:

This prevents udev rules which are dependent upon these fields from being properly processed.

On previous versions, such as SUSE Linux Server 15SP1, disks disk under ASM/AFD has ID_FS_TYPE.
e.g.
E: ID_FS_TYPE=oracleasm

Cause

When modules oracleacfs, oracleafd, oracleokm and oracleadvm are loaded, for cyber security sake, all files under /dev directory for AFD/ASM devices are deleted to ascertain that it can't be accessed by non authorized process.

Status

Reported to Engineering

Additional Information

Oracle Automatic Storage Management Filter Driver (ASMFD) (Doc ID 2806979.1)
https://support.oracle.com/knowledge/Oracle%20Database%20Products/2806979_1.html

Disclaimer

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