On Wed, Nov 09, 2011 at 07:58:44PM +0100, Goffredo Baroncelli wrote: > On Wednesday, 09 November, 2011 08:36:24 Chris Mason wrote: > > The only choice for an online operation is to make a new partition in > > front of the old one and just add that as a second disk in btrfs. > > > > The slow method of shifting the bytes down is probably a better long > > term choice. > > > > -chris > > Hi Chris, > > does the chunk tree be able to map the sectors "before" ? If so we should > only > "shift down" the map logical->physical in the chunk tree/device tree. > > The only exception should be the superblock which has to be moved. > > At the mount time we should pass a parameter which set how the data should be > moved backward. Then the kernel remap the chunk tree/device tree. > > I don't know if the gains is greater than the work, but from a theoretical > point of view, it should be doable..
Agreed, if we wanted to sit down and write a tool, it wouldn't be that complex. The only tricky part is maintaining alignment and position of the super blocks. -chris -- 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
