From: Austin S. Hemmelgarn Date: Wed, 23 Mar 2016 18:22:59 +0000 (-0400) Subject: btrfs: allow balancing to dup with multi-device X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=88be159c905a2b4f6d59afa352bef410afb6af02;p=linux-beck.git 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 Signed-off-by: David Sterba --- diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 745a619241c7..83dfed667637 100644 --- 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;