Re: udev keeps device label - BUG?
> Labels and UUIDs are stored only on the filesystems they come from and
> in the blkid cache in /etc/blkid.tab. That cache is cleared and
> regenerated whenever you reboot. You can do this at any time by
> running:
>
> blkid -c /dev/null -w /etc/blkid.tab
>
> udev does not have a database of its own; it uses blkid to look up
> labels and UUIDs.
>
> FAT filesystems actually have 2 labels, and not every tool writes to
> both of them. Looking at the code, I think mlabel tries to do so, but
> it might not be reliable. Try using dosfslabel instead, as I fixed that
> a little while ago and am confident that it does the right thing.
>
> Ben.
Hi Ben,
I tried, as you adviced me, but I got no success. I used your commands, but
this did not help. The strange thing is: if I create a new label, it is
recognized with the new label. But when I delete the new label using mlabel -i
/dev/sdb1, then the old label is again there.
Please look at this:
root@protheus7:~# mlabel -i /dev/sdb1 ::
Volume has no label
Enter the new volume label :
root@protheus7:~#
Now putting it out and again in, then it is recognized with label "BT4" (there
was formerly Backtrack4 on this card).
After it, I mount it in KDE4 using the hardwaremanager and starting dolpin.
Although, the drive has no label (I overwrote and deleted the label in
Windows,too), look at the udev stuff:
root@protheus7:~# ls -la /dev/.udev/links/ |grep BT4
drwxr-xr-x 2 root root 80 7. Mär 19:44 disk\x2fby-label\x2fBT4
root@protheus7:~#
And its content:
root@protheus7:/dev/.udev/links/disk\x2fby-label\x2fBT4# pwd
/dev/.udev/links/disk\x2fby-label\x2fBT4
root@protheus7:/dev/.udev/links/disk\x2fby-label\x2fBT4#
root@protheus7:/dev/.udev/links/disk\x2fby-label\x2fBT4# ls
b8:16 b8:17
root@protheus7:~# cat /dev/.udev/db/b8\:16
N:sdb
S:disk/by-id/usb-Single_Flash_Reader_058F63356336-0:0
S:disk/by-path/pci-0000:00:1d.7-usb-0:3:1.0-scsi-0:0:0:0
S:disk/by-uuid/474910bd-9497-4324-b3ea-d2ba465da4e1
S:disk/by-label/BT4
W:68
I:3876054641
E:ID_VENDOR=Single
E:ID_VENDOR_ENC=Single\x20\x20
E:ID_VENDOR_ID=058f
E:ID_MODEL=Flash_Reader
E:ID_MODEL_ENC=Flash\x20Reader\x20\x20\x20\x20
E:ID_MODEL_ID=6335
E:ID_REVISION=1.00
E:ID_SERIAL=Single_Flash_Reader_058F63356336-0:0
E:ID_SERIAL_SHORT=058F63356336
E:ID_TYPE=disk
E:ID_INSTANCE=0:0
E:ID_BUS=usb
E:ID_USB_INTERFACES=:080650:
E:ID_USB_INTERFACE_NUM=00
E:ID_USB_DRIVER=usb-storage
E:ID_PATH=pci-0000:00:1d.7-usb-0:3:1.0-scsi-0:0:0:0
E:ID_PART_TABLE_TYPE=dos
E:ID_FS_LABEL=BT4
E:ID_FS_LABEL_ENC=BT4
E:ID_FS_UUID=474910bd-9497-4324-b3ea-d2ba465da4e1
E:ID_FS_UUID_ENC=474910bd-9497-4324-b3ea-d2ba465da4e1
E:ID_FS_VERSION=1.0
E:ID_FS_TYPE=ext2
E:ID_FS_USAGE=filesystem
E:UDISKS_PRESENTATION_NOPOLICY=0
root@protheus7:~#
root@protheus7:~# cat /dev/.udev/db/b8\:17
N:sdb1
S:disk/by-id/usb-Single_Flash_Reader_058F63356336-0:0-part1
S:disk/by-path/pci-0000:00:1d.7-usb-0:3:1.0-scsi-0:0:0:0-part1
S:disk/by-uuid/6A25-5376
S:disk/by-label/BT4
W:70
I:3876148685
E:ID_VENDOR=Single
E:ID_VENDOR_ENC=Single\x20\x20
E:ID_VENDOR_ID=058f
E:ID_MODEL=Flash_Reader
E:ID_MODEL_ENC=Flash\x20Reader\x20\x20\x20\x20
E:ID_MODEL_ID=6335
E:ID_REVISION=1.00
E:ID_SERIAL=Single_Flash_Reader_058F63356336-0:0
E:ID_SERIAL_SHORT=058F63356336
E:ID_TYPE=disk
E:ID_INSTANCE=0:0
E:ID_BUS=usb
E:ID_USB_INTERFACES=:080650:
E:ID_USB_INTERFACE_NUM=00
E:ID_USB_DRIVER=usb-storage
E:ID_PATH=pci-0000:00:1d.7-usb-0:3:1.0-scsi-0:0:0:0
E:ID_PART_TABLE_TYPE=dos
E:ID_FS_LABEL=BT4
E:ID_FS_LABEL_ENC=BT4
E:ID_FS_UUID=6A25-5376
E:ID_FS_UUID_ENC=6A25-5376
E:ID_FS_VERSION=FAT32
E:ID_FS_TYPE=vfat
E:ID_FS_USAGE=filesystem
E:UDISKS_PRESENTATION_NOPOLICY=0
E:UDISKS_PARTITION=1
E:UDISKS_PARTITION_SCHEME=mbr
E:UDISKS_PARTITION_NUMBER=1
E:UDISKS_PARTITION_TYPE=0x0c
E:UDISKS_PARTITION_SIZE=1967120384
E:UDISKS_PARTITION_FLAGS=boot
E:UDISKS_PARTITION_SLAVE=/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-3/1-3:1.0/host10/target10:0:0/10:0:0:0/block/sdb
E:UDISKS_PARTITION_OFFSET=8192
E:UDISKS_PARTITION_ALIGNMENT_OFFSET=0
root@protheus7:~#
You see now, what I meant, with the database of udev. I deleted those files
and the directories, but they are created by udev, when I plugin the sd-card.
It is weired, because I cannot recognize, what is going on. I deleted also
/etc/blkid.tab, and rebooted, but also got no success. Really weired...
Hope, this helps a little bit.
Hans
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