On Wed, Jan 20, 2010 at 12:04 AM, Josef Bacik <jo...@redhat.com> wrote: > Hello, > > btrfs-image would be very helpful for debugging some users problems that we > can't reproduce ourselves, but every image that i try and re-create with > btrfs-image makes btrfs panic. This is because we zero out the superblocks > chunk array and re-create our uuid. This means that we end up not being able > to > read the chunk tree on mount, and then even if we could the uuid's of the > metadata we read back wouldn't match the uuid of the device. The way I've > fixed > this is to just spit the metadata back onto the disk exactly the way we got > it. > The caveat to this I think is that if we try to image a multi-device setup > that > it won't work right unless we have a multi-device setup to restore the image > onto. I'm not sure if thats the goal or not. This patch makes the single > disk > case work fine for me. Let me know what you think. Thanks, >
The goal of btrfs-image is create image that can be examined by btrfsck and btrfs-debug-tree. btrfs-image creates metadata image for btrfs' logical address space. So your patch only works for the uncommon case that btrfs' logical address is mapped to offset of device. Yan, Zheng -- 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
