On Tue, May 07, 2013 at 10:44:03AM +1000, Dmitry Smirnov wrote:
>
> When mounting ext4 with external journal the journal is discovered by
> using device number rather than UUID. Because of this mounting ext4
> with external journal often fails after reboot because devices
> /dev/sd[a-z] are not persistent. As such /dev/disk/by-* links can't
> help either as they are merely symlinks to /dev/sd[a-z].
>
> Please add support for ext4 external journal discovery using UUID.
This is technically not an e2fsprogs bug.
It is really up to the mount program (which is part of util-linux) or
the shell script which tries mounting the external journal to pass the
device number to the kernel via the journal_dev mount option. The way
to do this manually is via something like this:
devname=$(blkid -U $journal_uuid)
devno=$(stat -c "-x%t%T" $devname)
mount -t ext4 -O journal_dev=$devno /dev/$fsdev $mntpt
In the ideal work this is something that mount would be taught to do,
and mount is part of the util-linux package.
- Ted
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