Re: Retrieving disk info from sunvdc using udevadm
On Wed, Mar 15, 2017 at 1:14 AM, John Paul Adrian Glaubitz
<glaubitz@physik.fu-berlin.de> wrote:
> Hi!
>
> Some Debian users who are installing Debian for sparc64 in an LDOM run into
> the problem that the debian-installer is unable to detect the installation
> medium.
>
> Digging through the sources of the responsible debian-installer module, it
> turns out that d-i uses "udevadm info" to query information from all available
> block devices listed in /sys/block. To detect a CD-ROM, it looks for "ID_CDROM=1"
> or "ID_TYPE=cd".
>
> Unfortunately, this fails with sunvdc with a virtual CD-ROM drive as the data
> retrieved by "udevadm info" is very limited as compared to a standard PC with
> a physical CD-ROM drive.
>
> For comparison, on a SPARC T5, I get:
>
> /sys/block # udevadm info -q env -p /sys/block/vdiskd
> DEVLINKS=/dev/disk/by-uuid/2017-03-14-14-05-33-00 /dev/disk/by-label/Debian\x209.0\x20sparc64\x201
> DEVNAME=/dev/vdiskd
> DEVPATH=/devices/channel-devices/vdc-port-3-0/block/vdiskd
> DEVTYPE=disk
> ID_FS_LABEL=Debian_9.0_sparc64_1
> ID_FS_LABEL_ENC=Debian\x209.0\x20sparc64\x201
> ID_FS_TYPE=iso9660
> ID_FS_USAGE=filesystem
> ID_FS_UUID=2017-03-14-14-05-33-00
> ID_FS_UUID_ENC=2017-03-14-14-05-33-00
> ID_PART_TABLE_TYPE=sun
> MAJOR=254
> MINOR=24
> SUBSYSTEM=block
> USEC_INITIALIZED=634522
> /sys/block #
>
> Compare this to the output for a standard USB CD-ROM device on my laptop:
>
> glaubitz@ikarus:/sys/block$ udevadm info -q env -p /sys/block/sr0
> DEVLINKS=/dev/disk/by-path/pci-0000:00:14.0-usb-0:2:1.0-scsi-0:0:0:0 /dev/disk/by-id/usb-TSSTcorp_CDDVDW_SE-S084D_0j468695-0:0 /dev/dvdrw /dev/dvd /dev/cdrom
> /dev/cdrw
> DEVNAME=/dev/sr0
> DEVPATH=/devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0/host4/target4:0:0/4:0:0:0/block/sr0
> DEVTYPE=disk
> ID_BUS=usb
> ID_CDROM=1
> ID_CDROM_CD=1
> ID_CDROM_CD_R=1
> ID_CDROM_CD_RW=1
> ID_CDROM_DVD=1
> ID_CDROM_DVD_PLUS_R=1
> ID_CDROM_DVD_PLUS_RW=1
> ID_CDROM_DVD_PLUS_R_DL=1
> ID_CDROM_DVD_R=1
> ID_CDROM_DVD_RAM=1
> ID_CDROM_DVD_RW=1
> ID_CDROM_MRW=1
> ID_CDROM_MRW_W=1
> ID_FOR_SEAT=block-pci-0000_00_14_0-usb-0_2_1_0-scsi-0_0_0_0
> ID_INSTANCE=0:0
> ID_MODEL=CDDVDW_SE-S084D
> ID_MODEL_ENC=CDDVDW\x20SE-S084D\x20
> ID_MODEL_ID=1836
> ID_PATH=pci-0000:00:14.0-usb-0:2:1.0-scsi-0:0:0:0
> ID_PATH_TAG=pci-0000_00_14_0-usb-0_2_1_0-scsi-0_0_0_0
> ID_REVISION=TS00
> ID_SERIAL=TSSTcorp_CDDVDW_SE-S084D_0j468695-0:0
> ID_SERIAL_SHORT=0j468695
> ID_TYPE=cd
> ID_USB_DRIVER=usb-storage
> ID_USB_INTERFACES=:080250:
> ID_USB_INTERFACE_NUM=00
> ID_VENDOR=TSSTcorp
> ID_VENDOR_ENC=TSSTcorp
> ID_VENDOR_ID=0e8d
> MAJOR=11
> MINOR=0
> SUBSYSTEM=block
> SYSTEMD_READY=0
> TAGS=:systemd:uaccess:seat:
> USEC_INITIALIZED=16198574878
> glaubitz@ikarus:/sys/block$
>
> Would it be possible to extend sunvdc to display additional fields? In particular, it would be very useful
> if sunvdc could indicate whether the virtual block device is a regular disk or a CD-ROM drive.
Adrian,
wouldn't it be easier to patch d-i (userspace) to add support for
"ID_FS_TYPE=iso9660" as /dev/cdrom (besides of "ID_CDROM=1"), instead
of patching kernel (sunvdc.c) sources?
PS: running qemu on x86_64 as
$ qemu-system-sparc64 -hda hda.img -cdrom debian-7.11.0-sparc-netinst.iso
and inside qemu :
# udevadm info -q env -p /sys/block/sr0
DEVLINKS=/dev/cdrom1 /dev/disk/by-id/ata-EQUMD_DVR-MO_MQ0000_3
/dev/disk/by-label/Debian\x207.11.0\x20sparc\x201
/dev/disk/by-path/platform-ffe2b5a8-pci-0000:00:05.0-scsi-1:0:0:0
/dev/dvd1
DEVNAME=/dev/sr0
DEVPATH=/devices/root/ffe2b5a8/pci0000:00/0000:00:05.0/host1/target1:0:0/1:0:0:0/block/sr0
DEVTYPE=disk
GENERATED=1
ID_ATA=1
ID_BUS=ata
ID_CDROM=1
ID_CDROM_DVD=1
ID_CDROM_MEDIA=1
ID_CDROM_MEDIA_CD=1
ID_CDROM_MEDIA_SESSION_COUNT=1
ID_CDROM_MEDIA_TRACK_COUNT=1
ID_CDROM_MEDIA_TRACK_COUNT_DATA=1
ID_CDROM_MRW=1
ID_CDROM_MRW_W=1
ID_FS_LABEL=Debian_7.11.0_sparc_1
ID_FS_LABEL_ENC=Debian\x207.11.0\x20sparc\x201
ID_FS_TYPE=iso9660
ID_FS_USAGE=filesystem
ID_MODEL=EQUMD_DVR-MO
ID_MODEL_ENC=EQUMD\x20DVR-MO\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20
ID_PART_TABLE_TYPE=sun
ID_PATH=platform-ffe2b5a8-pci-0000:00:05.0-scsi-1:0:0:0
ID_PATH_TAG=platform-ffe2b5a8-pci-0000_00_05_0-scsi-1_0_0_0
ID_REVISION=.2+5
ID_SERIAL=EQUMD_DVR-MO_MQ0000_3
ID_SERIAL_SHORT=MQ0000_3
ID_TYPE=cd
MAJOR=11
MINOR=0
SUBSYSTEM=block
TAGS=:udev-acl:
UDEV_LOG=3
USEC_INITIALIZED=39425573
dmesg cut:
[ 37.995639] udevd[43]: starting version 175
[ 43.839280] SCSI subsystem initialized
[ 44.074912] libata version 3.00 loaded.
[ 44.168027] scsi0 : pata_cmd64x
[ 44.174100] scsi1 : pata_cmd64x
[ 44.175483] ata1: PATA max UDMA/33 cmd 0x1fe02008080 ctl
0x1fe02008100 bmdma 0x1fe02008280 irq 7
[ 44.176309] ata2: PATA max UDMA/33 cmd 0x1fe02008180 ctl
0x1fe02008200 bmdma 0x1fe02008288 irq 7
[ 44.197377] pata_cmd64x: active 10 recovery 10 setup 3.
[ 44.197550] pata_cmd64x: active 10 recovery 10 setup 3.
[ 44.366417] ata1.01: NODEV after polling detection
[ 44.368357] ata1.00: ATA-7: QEMU HARDDISK, 2.5+, max UDMA/100
[ 44.368716] ata1.00: 18874368 sectors, multi 16: LBA48
[ 44.369956] pata_cmd64x: active 3 recovery 1 setup 1.
[ 44.378555] ata1.00: configured for UDMA/33
[ 44.410389] scsi 0:0:0:0: Direct-Access ATA QEMU HARDDISK
2.5+ PQ: 0 ANSI: 5
[ 44.430084] pata_cmd64x: active 10 recovery 10 setup 3.
[ 44.430132] pata_cmd64x: active 10 recovery 10 setup 3.
[ 44.586422] ata2.01: NODEV after polling detection
[ 44.586997] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
[ 44.587517] pata_cmd64x: active 4 recovery 2 setup 1.
[ 44.588013] ata2.00: configured for UDMA/33
[ 44.592133] scsi 1:0:0:0: CD-ROM QEMU QEMU DVD-ROM
2.5+ PQ: 0 ANSI: 5
[ 45.049560] sd 0:0:0:0: [sda] 18874368 512-byte logical blocks:
(9.66 GB/9.00 GiB)
[ 45.057268] sd 0:0:0:0: [sda] Write Protect is off
[ 45.057602] sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
[ 45.059324] sd 0:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
[ 45.080040] sr0: scsi3-mmc drive: 4x/4x cd/rw xa/form2 tray
[ 45.080716] cdrom: Uniform CD-ROM driver Revision: 3.20
[ 45.097015] sr 1:0:0:0: Attached scsi CD-ROM sr0
[ 45.104671] sda: sda1 sda2 sda3
[ 45.114193] sd 0:0:0:0: [sda] Attached SCSI disk
[ 45.289872] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 45.298169] sr 1:0:0:0: Attached scsi generic sg1 type 5
[ 46.943661] device-mapper: uevent: version 1.0.3
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