On Nov 10, 2009, at 4:53 AM, Tomasz Chmielewski wrote: > Chris Ball wrote: >> Hi, >> > Is it possible, with current btrfs: >> Yes, I think so. >> > - to take a rootfs snapshot (i.e. prior to a major update), >> btrfsctl -s newsnap / >> > - do changes in the root filesystem (i.e. install major update), >> > > - if we don't like what the major update did to the system >> > (rootfs), "rollback" the snapshot and make it the "original" >> > rootfs again (perhaps, with a reboot in between). >> Before rebooting, edit whatever mounts your root partition (initrd, >> fstab, kernel argument) to add a "subvol=newsnap" mount argument. > > So, if I understand it correctly, it's not really "rolling back". > > Rather, with a "failed upgrade", we would mount a "newsnap" snapshot to use > the old rootfs again. > > > What's still left here would be: > > - remove the "failed upgrade" "(sub)volume" (which is "/" now?) > > - turn everything to such a state, so that you can mount the old/original > rootfs without adding any "subvol=newsnap" mount arguments > > > Correct me if I'm wrong.
You're right. What's needed is a way to set the new default subvol-- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
