Dear Maintainer,

udisksctl mount -b /dev/dvd
Object /org/freedesktop/UDisks2/block_devices/sr0 is not a mountable filesystem.

But mount /dev/dvd /mnt works fine.
Dec 26 16:59:03 mypc kernel: [ 1440.351767] sr0: detected capacity change from 1073741312 to 1472856064
Dec 26 17:00:50 mypc kernel: [ 1547.482894] UDF-fs: INFO Mounting volume 'doc', timestamp 2019/03/27 08:59 (1000)

$ udfinfo /dev/dvd
filename=/dev/dvd
label=PLU dd
uuid=0f340b28504c5569
lvid=PLU dd
vid=PLU dd
vsid=PLU dd
fsid=PLU dd
fullvsid=0F340B28PLU dd
winserialnum=0x05bc0e35
blocksize=2048
blocks=719168
usedblocks=643386
freeblocks=0
behindblocks=0
numfiles=401
numdirs=89
udfrev=1.02
udfwriterev=1.02
integrity=closed
accesstype=readonly
start=16, blocks=3, type=VRS
start=32, blocks=16, type=MVDS
start=64, blocks=1, type=LVID
start=256, blocks=1, type=ANCHOR
start=288, blocks=643386, type=PSPACE
start=643674, blocks=16, type=RVDS
start=718911, blocks=1, type=ANCHOR
start=719167, blocks=1, type=ANCHOR

Please enable DVD UDF partitions with udisks.

Regards.

Other informations:
$ udisksctl info -b /dev/dvd
/org/freedesktop/UDisks2/block_devices/sr0:
  org.freedesktop.UDisks2.Block:
    Configuration:              []
    CryptoBackingDevice:        '/'
    Device:                     /dev/sr0
    DeviceNumber:               2816
    Drive:                      '/org/freedesktop/UDisks2/drives/Optiarc_DVD_RW_AD_5280S_Optiarc_DVD_RW_AD_5280S'
    HintAuto:                   true
    HintIconName:
    HintIgnore:                 false
    HintName:
    HintPartitionable:          false
    HintSymbolicIconName:
    HintSystem:                 false
    Id:
    IdLabel:
    IdType:
    IdUUID:
    IdUsage:
    IdVersion:
    MDRaid:                     '/'
    MDRaidMember:               '/'
    PreferredDevice:            /dev/sr0
    ReadOnly:                   true
    Size:                       1472856064
    Symlinks:                   /dev/cdrom
                                /dev/cdrw
                                /dev/disk/by-id/ata-Optiarc_DVD_RW_AD-5280S
                                /dev/disk/by-path/pci-0000:00:11.0-ata-2
                                /dev/dvd
                                /dev/dvdrw
    UserspaceMountOptions:
$ udevadm info /dev/dvd
P: /devices/pci0000:00/0000:00:11.0/ata4/host3/target3:0:0/3:0:0:0/block/sr0
N: sr0
L: -100
S: dvdrw
S: cdrw
S: dvd
S: disk/by-id/ata-Optiarc_DVD_RW_AD-5280S
S: disk/by-path/pci-0000:00:11.0-ata-2
S: cdrom
E: DEVPATH=/devices/pci0000:00/0000:00:11.0/ata4/host3/target3:0:0/3:0:0:0/block/sr0
E: DEVNAME=/dev/sr0
E: DEVTYPE=disk
E: MAJOR=11
E: MINOR=0
E: SUBSYSTEM=block
E: USEC_INITIALIZED=2273561
E: ID_CDROM=1
E: SYSTEMD_MOUNT_DEVICE_BOUND=1
E: ID_CDROM_CD=1
E: ID_CDROM_CD_R=1
E: ID_CDROM_CD_RW=1
E: ID_CDROM_DVD=1
E: ID_CDROM_DVD_R=1
E: ID_CDROM_DVD_RW=1
E: ID_CDROM_DVD_PLUS_R=1
E: ID_CDROM_DVD_PLUS_RW=1
E: ID_CDROM_DVD_PLUS_R_DL=1
E: ID_CDROM_MRW=1
E: ID_CDROM_MRW_W=1
E: ID_CDROM_MEDIA=1
E: ID_CDROM_MEDIA_DVD_PLUS_R=1
E: ID_CDROM_MEDIA_STATE=appendable
E: ID_CDROM_MEDIA_SESSION_NEXT=4
E: ID_CDROM_MEDIA_SESSION_COUNT=4
E: ID_CDROM_MEDIA_SESSION_LAST_OFFSET=1418657792
E: ID_CDROM_MEDIA_TRACK_COUNT=4
E: ID_CDROM_MEDIA_TRACK_COUNT_DATA=3
E: ID_ATA=1
E: ID_TYPE=cd
E: ID_BUS=ata
E: ID_MODEL=Optiarc_DVD_RW_AD-5280S
E: ID_MODEL_ENC=Optiarc\x20DVD\x20RW\x20AD-5280S\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
E: ID_REVISION=1.01
E: ID_SERIAL=Optiarc_DVD_RW_AD-5280S
E: ID_ATA_FEATURE_SET_PM=1
E: ID_ATA_FEATURE_SET_PM_ENABLED=1
E: ID_ATA_SATA=1
E: ID_ATA_SATA_SIGNAL_RATE_GEN1=1
E: ID_PATH=pci-0000:00:11.0-ata-2
E: ID_PATH_TAG=pci-0000_00_11_0-ata-2
E: ID_FOR_SEAT=block-pci-0000_00_11_0-ata-2
E: DEVLINKS=/dev/dvdrw /dev/cdrw /dev/dvd /dev/disk/by-id/ata-Optiarc_DVD_RW_AD-5280S /dev/disk/by-path/pci-0000:00:11.0-ata-2 /dev/cdrom
E: TAGS=:systemd:seat:uaccess: