On Wed, 28 Jul 2021, Wang Yugui wrote:

Hi,

We no longer need the dummy inode(BTRFS_FIRST_FREE_OBJECTID - 1) in this
patch serials?

No.

I tried to backport it to 5.10.x, but it failed to work.
No big modification in this 5.10.x backporting, and all modified pathes
are attached.

I'm not surprised, but I doubt there would be a major barrier to making
it work.  I'm unlikely to try until I have more positive reviews.

Thanks,
NeilBrown