Date: Thu, 8 May 2003 15:03:41 -0400 From: Ali Bahar <alih@internetDog.org> To: freebsd-hackers@freebsd.org Subject: Re: cache_purge > cache_zap segmentation fault Message-ID: <20030508150341.B28906@internetDog.org> In-Reply-To: <1342.1052417320@critter.freebsd.dk>; from phk@phk.freebsd.dk on Thu, May 08, 2003 at 08:08:40PM %2B0200 References: <20030508140210.B26126@internetDog.org> <1342.1052417320@critter.freebsd.dk>
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Hi dude,
(not quite sure which'd be your first name. 'phk' is how I remember
you by!)
On Thu, May 08, 2003 at 08:08:40PM +0200, Poul-Henning Kamp wrote:
> In message <20030508140210.B26126@internetDog.org>, Ali Bahar writes:
> >I still need to understand the difference between a vnode's
> >v_cache_src and v_cache_dst (IOW, a namecache's nc_src and nc_dst),
>
> One is for the chain which a (directory) vnode sources, the other
> is the chain where the (any type) vnode hangs from it's parent
> directory.
Hmm. Forgive me, but I went over the above sentence 20 times, and I'm
still not sure.
Given the vnode for /usr/src,
- is its v_cache_dst a linked list of namecache entries for /usr,
- & its v_cache_src a linked list of namecache entries for /usr/src/sys ?
Or vice versa? Or neither?
Why would there be a _chain_ of namecache nodes for a file's parent? I
assume that symbolic links are involved (from another dir to this file).
Would you know if the 5.0 modifications could fix this problem? My
reading of the problem is: As a new file/dir is being accessed, a new
vnode is obtained thru getnewvnode. But vnodes are recycled, and so
the 'new' vnode has to be cleaned up. This means that all its old
associations/resources have to be deleted. What is happening in
cache_zap, is that its "source vnode list" of namecache entries is
being deleted. In the deletion, it comes across a dangling/corrupt
namecache node.
Thank you very much for your help. Much appreciated.
regards,
ali
--
Jesus was an Arab.
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