btrfs: raid56: allow the exact minimum number of devices for balance convert

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The minimum number of devices for RAID5 is 2, though this is only a bit
expensive RAID1, and for RAID6 it's 3, which is a triple copy that works
only 3 devices.

mkfs.btrfs allows that and mounting such filesystem also works, so the
conversion via balance filters is inconsistent with the others and we
should not prevent it.

Signed-off-by: David Sterba <dsterba@suse.com>

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David Sterba 2019-05-17 11:43:15 +02:00

parent 0ee5f8ae08

commit 49cc180ca9

1 changed files with 4 additions and 3 deletions

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7

fs/btrfs/volumes.c

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