On Fri, Mar 05, 2021 at 11:26:29AM -0800, Boris Burkov wrote:
> The tree checker currently rejects unrecognized flags when it reads
> btrfs_inode_item. Practically, this means that adding a new flag makes
> the change backwards incompatible if the flag is ever set on a file.
> Take up one of the 4 reserved u64 fields in the btrfs_inode_item as a
> new "compat_flags". These flags are zero on inode creation in btrfs and
> mkfs and are ignored by an older kernel, so it should be safe to use
> them in this way.
> Signed-off-by: Boris Burkov <bo...@bur.io>

How does this interact with the RO_COMPAT filesystem flag which is also being

- Eric

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