btrfs_block_rsv_add
ret = btrfs_block_rsv_add(fs_info,
int btrfs_block_rsv_add(struct btrfs_fs_info *fs_info,
ret = btrfs_block_rsv_add(fs_info, dst_rsv, num_bytes,
ret = btrfs_block_rsv_add(fs_info, trans->block_rsv,
ret = btrfs_block_rsv_add(fs_info, rc->block_rsv, num_bytes,
ret = btrfs_block_rsv_add(fs_info, rsv, num_bytes,
pending->error = btrfs_block_rsv_add(fs_info,