btrfs: allow balancing to dup with multi-device

Currently, we don't allow the user to try and rebalance to a dup profile
on a multi-device filesystem.  In most cases, this is a perfectly sensible
restriction as raid1 uses the same amount of space and provides better
protection.

However, when reshaping a multi-device filesystem down to a single device
filesystem, this requires the user to convert metadata and system chunks
to single profile before deleting devices, and then convert again to dup,
which leaves a period of time where metadata integrity is reduced.

This patch removes the single-device-only restriction from converting to
dup profile to remove this potential data integrity reduction.

Signed-off-by: Austin S. Hemmelgarn <ahferroin7@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 745a619..83dfed6 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3700,10 +3700,8 @@ int btrfs_balance(struct btrfs_balance_control *bctl,
                num_devices--;
        }
        btrfs_dev_replace_unlock(&fs_info->dev_replace, 0);
-       allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE;
-       if (num_devices == 1)
-               allowed |= BTRFS_BLOCK_GROUP_DUP;
-       else if (num_devices > 1)
+       allowed = BTRFS_AVAIL_ALLOC_BIT_SINGLE | BTRFS_BLOCK_GROUP_DUP;
+       if (num_devices > 1)
                allowed |= (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1);
        if (num_devices > 2)
                allowed |= BTRFS_BLOCK_GROUP_RAID5;