[PATCH AUTOSEL for 4.9 092/293] Btrfs: skip commit transaction if we don't have enough pinned bytes

From: Liu Bo [ Upstream commit 28785f70ef882e4798cd5706066a55dbf7adf80e ] We commit transaction in order to reclaim space from pinned bytes because it could process delayed refs, and in may_commit_transaction(), we check first if pinned bytes are enough for the required

[PATCH AUTOSEL for 4.9 092/293] Btrfs: skip commit transaction if we don't have enough pinned bytes

From: Liu Bo [ Upstream commit 28785f70ef882e4798cd5706066a55dbf7adf80e ] We commit transaction in order to reclaim space from pinned bytes because it could process delayed refs, and in may_commit_transaction(), we check first if pinned bytes are enough for the required space, we then check if