Devices and namei(9).

[Paweł Jakub Dawidek]

Hi.

I got problem with namei(9) and some devices.
Example (catching syscall open()):
static int
n_open(register struct proc *p, register struct open_args *ea)
{
[...]
        long finode = 0;
        struct nameidata nd, *ndptr;
[...]
        ndptr = &nd;
        NDINIT(ndptr, LOOKUP, FOLLOW | SAVENAME, UIO_USERSPACE, ea->path, p);
        if (!namei(ndptr))
                if (!VOP_GETATTR(ndptr->ni_vp, &va, p->p_ucred, p))
                        finode = va.va_fileid;
[...]
}

I use namei() coz i want file inode.
But when namei() will be called some devices are blocking.
For example if I do in this way:
[...]
        return open(p, ea);
        if (!namei(ndptr))
[...]
Everything is oke, but:
        namei(ndptr)
        return open(p, ea);
isn't.
% mpg123 some.mp3
Can't open /dev/dsp!

And /dev/dsp is completely fucked up, it is still busy even if I unload my
module. Only reboot can free it.

So what's going on?
Or maybe there is some other way to get file inode?

-- 
Paweł Jakub Dawidek
Network Administrator.
Am I Evil? Yes, I Am.

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