Btrfs: don't re-enter when allocating a chunk

If we start running low on metadata space we will try to allocate a chunk,
which could then try to allocate a chunk to add the device entry.  The thing
is we allocate a chunk before we try really hard to make the allocation, so
we should be able to find space for the device entry.  Add a flag to the
trans handle so we know we're currently allocating a chunk so we can just
bail out if we try to allocate another chunk.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 86bb105b3982..24fde97cba81 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -385,6 +385,7 @@ again:
         h->qgroup_reserved = qgroup_reserved;
         h->delayed_ref_elem.seq = 0;
         h->type = type;
+        h->allocating_chunk = false;
         INIT_LIST_HEAD(&h->qgroup_ref_list);
         INIT_LIST_HEAD(&h->new_bgs);