Hi Anthony, I think that for you may be interested to read this thread http://kerneltrap.org/mailarchive/linux-btrfs/2009/11/20/6588643/thread and to read a my blog about this argument http://kreijack.blogspot.com/2010/01/linux-btrfs-example-of-layout.html Regards Goffredo >----Messaggio originale---- >Da: anthony@xxxxxxxx >Data: 19/05/2010 8.50 >A: <linux-btrfs@xxxxxxxxxxxxxxx> >Ogg: default subvolume abilities/restrictions > >hi, > >i'm working on an initrd hook >[http://aur.archlinux.org/packages.php?ID=33376] to support >non-volatile system rollbacks (promoting a temporary rollback snapshot >to the new active/default). when the system is installed to the >default/"." subvolume (as many users probably initially do), it is >more difficult/messier to manage system state; there are empty folders >in each "child" snapshot where a subvolume used to exist (this seems >like BUG to me, dir should not exist?) in the default subvolume. these >grow/vary with time. to work around this and for cleaner >implementation, i'll intend to permanently boot a named subvolume >[__active] (though its contents may be swapped out). ultimately, i >have to tell the user to manually remove the old junk (/usr, /etc, >/var, etc...) from the default subvolume (since its really in the >/__active subvolume) > >moving along to a question... can the default subvolume be >swapped/removed/renamed/popped/shifted? > >what would have been useful, would be the ability to generate an >empty, parent subvolume to _contain_ the current one, and rename it to >__active. btrfs gives rise to a "subroot" structure; the structure >beneath the root. > >is something like this possible or can be added? > >an alternative idea i had was "promoting" a subvolume to be the new >root, and anything "above" the new root is lost/forgotten. then i >could create the subroot structure in a subvol, snapshot the default >subvol to where i want it, and promote the subvol to be the new root. >like a permanent pivot_root/chroot. > >great stuff, > >C Anthony >-- >To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in >the body of a message to majordomo@xxxxxxxxxxxxxxx >More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
