linux-ext4 - Re: quick question on journal

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Message-ID: <20090714185241.GA30638@atrey.karlin.mff.cuni.cz>
Date:	Tue, 14 Jul 2009 20:52:41 +0200
From:	Jan Kara <jack@...e.cz>
To:	Doug Hunley <doug@...ley.homeip.net>
Cc:	linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: quick question on journal_checksum

  Hi,

> If one specifies journal_checksum as a mount option for an ext4
> rootfs, it should show up in the output of 'mount', yes? I'm not
> seeing it.
> 
> My grub line:
> kernel /boot/vmlinuz-2.6.30-gentoo-r1 rw vga=0x31B
> video=vesafb:1280x1024-24,mtrr:3,ywrap hpet=force fastboot quiet
> forcedeth.msi=1 forcedeth.msix=1 forcedeth.dma_64bit=1 root=/dev/md3
> rootfstype=ext4 rootflags=journal_checksum
> 
> and the 'mount' output:
> rootfs on / type rootfs (rw)
> /dev/root on / type ext4 (rw,relatime,barrier=1,data=writeback)
> 
> Is this related to barriers failing? From dmesg:
> JBD: barrier-based sync failed on md3:8 - disabling barriers
  This is unrelated. It's a bug in how ext4 shows options in
/proc/mounts. Attached patch should fix it. Ted, will you merge it
please?

							Honza
-- 
Jan Kara <jack@...e.cz>
SuSE CR Labs

View attachment "0001-ext4-Show-journal_checksum-option.patch" of type "text/x-diff" (913 bytes)