bytes free的意思|示意

If per-user quotas are being used, this value may be less than the total number of free bytes on a disk.

若用户磁盘配额被启用，该值可能小于总空闲空间容量。

The only thing we have to do to free memory is to take the pointer we're given, back up sizeof (struct mem_control_block) bytes, and mark it as available. Here is the code for that.

为了释放内存，我们必须要做的惟一一件事情就是，获得我们给出的指针，回退size of (struct mem_control_block)个字节，并将其标记为可用的。

The number of free bytes in the cache can be found at bottom.

可以在底部找到缓存中的空闲字节数。

Then, when they pass the pointer back via free , we simply back up a few memory bytes to find this structure again.

然后，当通过free将该指针传递回来时，我们只需要倒退几个内存字节就可以再次找到这个结构。

An implementation is free to return fewer bytes than requested even if the end of the stream has not been reached.

即使尚未到达流的末尾，实现仍可以随意返回少于所请求的字节。

A block is allocated from the free pool by first converting the requested bytes to an index in the bucket array, using the following equation.

当从空闲池分配块时，首先使用以下公式把请求的字节数转换为bucket数组索引。