Re: [Xen-users] Ext4 error on DomU

["Olivier B." <xen.list@xxxxxxxxx>]

Well, in the 2.6.28.7 changelog I found that :

   Xen doesn't report that barriers are not supported until buffer I/O is
   reported as completed, instead of when the buffer I/O is submitted.
   Add a check and a fallback codepath to journal_wait_on_commit_record()
   to detect this case, so that attempts to mount ext4 filesystems on
   LVM/devicemapper devices on Xen guests don't blow up with an "Aborting
   journal on device XXX"; "Remounting filesystem read-only" error.

As there is a lot of Ext4 fixes too, I will upgrade my kernel before continue.

Olivier


Olivier B. a écrit :
> Hello,
>
> I suppose it's a Xen problem, but it can be an Ext4 problem : just 
> after mounting an ext4 partition, I tried to move (mv) a rsnapshot dir 
> from an ext3 (xvda2) partition to the ext4 (xvda3) one.
> Some symbolic links was moved, then there is this error :
>    Feb 24 13:30:40 sofia kernel: EXT4-fs: mounted filesystem with 
> ordered data mode.
>    Feb 24 13:31:35 sofia kernel: blkfront: xvda3: write barrier op failed
>    Feb 24 13:31:35 sofia kernel: blkfront: xvda3: barriers disabled
>    Feb 24 13:31:35 sofia kernel: end_request: I/O error, dev xvda3, 
> sector 50593912
>    Feb 24 13:31:35 sofia kernel: end_request: I/O error, dev xvda3, 
> sector 50593912
>    Feb 24 13:31:35 sofia kernel: Aborting journal on device xvda3:8.
>    Feb 24 13:31:35 sofia kernel: ext4_abort called.
>    Feb 24 13:31:35 sofia kernel: EXT4-fs error (device xvda3): 
> ext4_journal_start_sb: Detected aborted journal
>    Feb 24 13:31:35 sofia kernel: Remounting filesystem read-only
>
> But I don't see anything in Xen logs.
> Does someone know what is the cause ?
>
> Thanks,
> Olivier
> PS : I use a 2.6.28.6 kernel, Dom0 and DomU are Debian Lenny 64bit, 
> and VT is enabled.
>
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