On Thu, Oct 20, 2011 at 10:29:49PM -0500, Matt Parnell wrote:
> The output of /proc/cmdline on 3.0.7:
>
> BOOT_IMAGE=/boot/vmlinuz26-zen root=/dev/sdb1 ro rootfstype=ext4
> rootflags=data=writeback noatime nodiratime barrier=0 discard
> noinitrd
>
>
> On 10/09/2011 06:44 PM, Ted Ts'o wrote:
> >On Sun, Oct 09, 2011 at 05:10:54PM -0500, Matt Parnell wrote:
> >>/proc/mounts (as you can see it's not being remounted rw for some
> >>reason - /dev/sdc1 is the flash drive I used to pipe this info onto):
> >>
> >>rootfs / rootfs rw 0 0
> >>/dev/root / ext4 ro,relatime,barrier=1 0 0
I haven't had a chance to check on v3.0 (I'm currently travelling and
penning this from an airplane), but on v3.1-rc3, it works for me under
KVM. I fire up kvm-qemu this way:
$QEMU -enable-kvm -boot order=c $NET \
-drive file=$ROOT_QCOW2,if=virtio$SNAPSHOT \
-drive file=$VDB,cache=none,if=virtio \
-drive file=$VDC,cache=none,if=virtio \
-drive file=$VDD,cache=none,if=virtio \
-nographic -smp $NR_CPU -m $MEM \
--kernel $KERNEL \
--append "root=/dev/vda console=ttyS0,115200 rootflags=data=writeback" |\
tee $LOGFILE
with this in /proc/cmdline:
candygram:~# cat /proc/cmdline
root=/dev/vda console=ttyS0,115200 rootflags=data=writeback maint
... and this is what I have in /proc/mounts:
candygram:~# head -2 /proc/mounts
rootfs / rootfs rw 0 0
/dev/root / ext4 rw,noatime,user_xattr,acl,barrier=1,data=writeback 0 0
... and what I have in /etc/fstab:
UUID=ce4d6b98-2aa9-42d4-a127-995a795a0b02 / ext4 noatime,data=writeback 0 1
The kvm image I'm using is using Debian unstable image generated using
debootstrap, and uses no modules or initrd's --- which makes it easier
for me to boot since $KERNEL is set to:
/tyt/linux/ext4/arch/x86/boot/bzImage
This allows me to fire up test kernel right from my build tree,
without needing to set up any kind of initrd nonsense. :-)
- Ted
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