From: Eric Dumazet <[email protected]>
Date: Tue, 31 Oct 2006 19:48:48 +0100
> We currently insert sockets/pipes dentries into the global dentry
> hashtable. This is *useless* because there is currently no way
> these entries can be used for a lookup(). (/proc/xxx/fd/xxx uses a
> different mechanism)
It turns out that while procfs uses a different "mechanism", those
procfs symlinks do point to the real socket dentry, so when you
readlink() on it you do d_path() on the real socket dentry.
If you unhash these things, I'm pretty sure you'll see an ugly
"(deleted)" at the end of the symlink string for /proc/$pid/fd/$X
files that are sockets or something like that.
Al Viro just suggested a way around this to me:
1) Just mark the dentry HASHED by hand in the dentry flags, but don't
actually hash it.
2) Create a special dentry->d_deleted method for sockets that returns
0 and clears by hand the HASHED flag bit in the dentry (see what
dput() does when this happens).
It's an abuse but it will work.
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