btrfs: fix min reserved size calculation in merge_reloc_root
The minimum reserve size was adjusted to take into account the height of
the tree we are merging, however we can have a root with a level == 0.
What we want is root_level + 1 to get the number of nodes we may have to
cow. This fixes the enospc_debug warning pops with btrfs/101.
Fixes: 44d354abf33e ("btrfs: relocation: review the call sites which can be interrupted by signal")
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
1 file changed
