On 04/22/2017 06:55 PM, Chris Murphy wrote: > On Sat, Apr 22, 2017 at 10:45 AM, Chris Murph >> The proper way to do this in Btrfs terms would be to COW all of the >> changed chunk tree nodes elsewhere, all the unneeded items are >> removed. New CRCs. And then once that succeeds and is committed to >> stable media, new supers written to point to the new chunk and dev >> trees which in turn now only point to one of the already written >> copies of metadata chunks, without writing out new chunks. > > Also probably needs free space cache or tree updated. But the main > point is that nothing is overwritten in Btrfs. It'd always be COW so > it's fail safe. Free space tree only deals with the virtual address space, so it won't see any difference. -- Hans van Kranenburg -- 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
