btrfs-progs 5.11 warns about RAID5/6 for RAID0

[tavianator]

I'm just trying to balance some low-usage raid0 blocks, but with the new version of btrfs-progs I get

# btrfs balance start --bg -dconvert=raid0,profiles=raid0,usage=80 /mnt/neutrino
WARNING:

        RAID5/6 support has known problems and is strongly discouraged
        to be used besides testing or evaluation. It is recommended that
        you use one of the other RAID profiles.
        The operation will continue in 10 seconds.
        Use Ctrl-C to stop.
10 9^C

[tavianator]

Looking at 1ed5db8, it seems that BTRFS_BALANCE_ARGS_CONVERT and BTRFS_BLOCK_GROUP_RAID6 are both (1ULL << 8). I guess it should be checking profiles not flags?

[amstan]

I see this for raid1 and raid1c3 profiles as well.

[tavianator]

Ha hey Alex, been a while! How's it going?

[kdave]

Right, that's broken.

[kdave]

I guess it should be checking profiles not flags?

profiles corresponds to the profiles= option, the right one is flags->target, as the conversion target bg profile. Fix in devel, with a test.