On 2022/6/15 21:21, Christoph Hellwig wrote:
On Tue, Jun 14, 2022 at 04:50:22PM +0800, Qu Wenruo wrote:
The same way as data?
map-logical to find the location of a mirror, write 4 bytes of zero into
the location, then call it a day.
Although for metadata, you may want to choose a metadata that would
definitely get read.
Thus tree root is a good candidate.
And how do I find out the logic address of the tree root?
For tree root, "btrfs ins dump-super <dev> | grep '^root\s'.
For other tree blocks, "btrfs ins dump-tree <dev>" then with other other
keywords to grab.
Thanks,
Qu
