Jim Carter wrote:
>
>>For justification to it's worth, some institutions have file servers
>>that export hundreds or even thousands of shares over NFS. As /net is
>>really just a kind of executable indirect map that returns multimounts
>>for each hostname used as a key, just doing 'cd /net/hostname' may
>>potentially mount hundreds of filesystems. This is not cool!
>
> Definitely not cool. But some users (yours truly among them) do "alias ls
> 'ls -F'", which requires "ls" to stat (and thus mount) every exported
> filesystem. More uncool, and I don't see any non-disgusting way around it.
>
No, it doesn't... this has been covered several times already. It
requires ls to *lstat* the point; it only does a stat() if the resulting
entry is S_IFLNK. The same is true for GUI tools. There is a fairly
easy way to distinguish lstat() from virtually all other filesystem
calls -- it doesn't invoke follow_link. So the answer is simply to
create an inode which is S_IFDIR but has a follow_link method. The
follow_link method triggers a mount. This is called a "pseudo-symlink
directory" or sometimes "ghost directory".
-hpa
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