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Re: How to make character devices in non spec-fs file systems
>> Eh? I don't understand. Your character devices should be VCHR.
> Yes, but if I do that, the VFS code in the kernel will call specfs
> functions on my vnode, because there are hardcoded checks like:
> if (vn->v_type == VCHR)
> call into specfs code(vn);
Yes. That's how device special files work.
> And because my vnode is not initialised by specfs, it panics. I am
> not using specfs for my character device. I am using a separately
> mounted filesystem called "FreeBSD devfs".
specfs is not a filesystem in the sense of something mountable. It's a
collection of code for implementing various special things, such as
device special files, which othewise would mean a bunch of relatively
complicated code duplicated in every device-supporting filesystem. I'd
suggest you look at how existing filesystems, like ffs and nfs,
implement VCHR and VBLK vnodes; that should be able to guide you in
when and how you need to make calls into the specfs code.
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