On Tue, Mar 30, 2021 at 08:28:11AM -0700, Darrick J. Wong wrote:

Do you want to put dmevmask/dmstate preservation on the deprecated list
too, seeing as the only (out of tree) user wrote in on the last
submission to say that they're not supporting it past 2022 and have
never supported mounting those XFSes with upstream kernels?

Granted, the difficulty there is how do you deprecate something that
isn't there? 8)

Yeah.  I'm not sure what to really do about this.  In practice I
suspect v5 file systems with these flags simply do not exist.  The
cost to maintain the flag is pretty low, so I'm not sure the
deprecation is that important.  I'd rather just reuse the flags
next time we add a new incompat feature that needs them, at which
point we have our normal feature mechanism take care of it.