On Thu, Aug 6, 2015 at 3:58 PM, Kent Overstreet
[off-list ref] wrote:

On Tue, Jul 28, 2015 at 11:41:52AM -0700, Ming Lin wrote:

quoted

On Fri, Jul 24, 2015 at 1:47 PM, Ming Lin [off-list ref] wrote:

quoted

And I want to learn how the btree node insert/delete/update happens on
disk. These maybe too detail. I'm going to write a small tool to dump
the file system. Then I could understand better the on disk btree
format.

Here is my simple tool to dump parts of the on-disk format.
http://www.minggr.net/cgit/cgit.cgi/bcache-tools/commit/?id=deb258e2

It's not in good shape, but simple enough to learn the on-disk format.

Hey! Sorry for taking so long to respond, just got my computer set up back in
Alaska.

If you want to keep going with your tool, this might be a starting point for a
debugfs tool - which bcache definitely needs at some point.

Yes, that's my goal.
I'll improve it once I get more familiar with bcachefs on-disk format.