linux-ext4 - Re: /dev/disk/by-label missing after upgrade to 1.42.7

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Date:	Thu, 13 Jun 2013 15:45:05 -0400
From:	Autif Khan <autif.mlist@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Re: /dev/disk/by-label missing after upgrade to 1.42.7

On Thu, Jun 13, 2013 at 2:55 PM, Autif Khan <autif.mlist@...il.com> wrote:
> Hi,
>
> We are using /dev/disk/by-label/OURLABEL to mount USB disk partitions.
>
> We were using Ubuntu 12.04 with 1.42 version of e2fsprogs - where we
> encountered SSD corruption issues on unclean powerdown. It was
> suggested that we upgrade to the latest e2fsprogs
> (http://marc.info/?l=linux-ext4&m=137035378614543&w=2).
>
> After the upgrade to 1.42.7, we do not have /dev/disk/by-label
>
> I am not sure if this is the right place to ask this - but I thought
> that I should start here and ask in udev mailing list later - (that
> whole thing about correlation mumble causation).
>
> I am still researching how /dev/disk/by-label comes into existence -
> please advice if there is something obvious that I am missing.
>

Thanks djwong#ext4 for all the help on IRC

It seems like blkid -o udev /dev/sdb1 displays info about the volume -
which is used by udev rules to populates /dev/disk/by-label

The output when e2fsprogs version 1.42 was used:

ubuntu@...0013950af6fb:/lib/udev/rules.d$ sudo blkid -o udev -p /dev/sdb1
ID_FS_LABEL=KOKO
ID_FS_LABEL_ENC=KOKO
ID_FS_UUID=56D8-F5EE
ID_FS_UUID_ENC=56D8-F5EE
ID_FS_VERSION=FAT32
ID_FS_TYPE=vfat
ID_FS_USAGE=filesystem
ID_PART_ENTRY_SCHEME=dos
ID_PART_ENTRY_TYPE=0xb
ID_PART_ENTRY_FLAGS=0x80
ID_PART_ENTRY_NUMBER=1
ID_PART_ENTRY_OFFSET=32
ID_PART_ENTRY_SIZE=251616
ID_PART_ENTRY_DISK=8:16


The output when e2fsprogs version 1.42.7 was used:
ubuntu@...001395089897:~$ sudo blkid -o udev /dev/sda1
Invalid output format udev. Choose from value,
    device, list, or full

BTW, sudo blkid -o full /dev/sdb1 worked just fine - had the LABEL and
everything.

Also - looks like 1.42.7 does not support the -p option. From the man page:

-p     Switch to low-level superblock probing mode (bypass cache).

Is there a configuration option that will allow blkid to display udev
output formats? I could not find with ./configure --help

Thanks

Autif
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