Re: what is necessary for directory hard links

From: Joshua Hudson
Date: Sat Jul 22 2006 - 14:13:15 EST

On 7/22/06, Bodo Eggert <7eggert@xxxxxxxxxxxx> wrote:
Horst H. von Brand <vonbrand@xxxxxxxxxxxx> wrote:

> Joshua Hudson <joshudson@xxxxxxxxx> wrote:
>> This patch is the sum total of all that I had to change in the kernel
>> VFS layer to support hard links to directories
> Can't be done, as it creates the possibility of loops.

Don't do that then?

> Detecting unconnected subgraphs uses a /lot/ of memory; and much worse, you
> have to stop (almost) all filesystem activity while doing it.
I know.

I just decided the price is worth it.

In my filesystem, any attempt to create a loop of hard links
is detected and cancelled. Unlinking a directory requires it
to be empty if the last link is being removed. "." and ".."
links are counted separately from real links, so that is easy.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at