Re: Freeing vnodes.

From: David Schultz (das_at_FreeBSD.ORG)
Date: 03/29/05

  • Next message: Jeff Roberson: "Re: Freeing vnodes." 
    Date: Mon, 28 Mar 2005 23:49:05 -0500
To: Jeff Roberson <jroberson@chesapeake.net>

    On Mon, Mar 28, 2005, Jeff Roberson wrote:
    > > > I am worried about the v_dd,v_ddid fields of a directory B that has the
    > > > to be released vnode A as parent. (Obviously in this case there is no
    > > > namecache entry with the vnode A as the directory (nc_dvp))
    > > >
    > > > Right now A is type stable - but if A is released, access to B->v_dd
    > > > may cause a page fault.
    > > >
    > > > Stephan
    > >
    > > Jeff,
    > >
    > > Do you plan to address the problem now that the code is checked in?
    >
    > Vnodes with children in the name cache are held with vhold() and not
    > recycled.

    Yes, but cache_purge() is called directly in a number of places
    where the vnode may have children, e.g. in mount. So dangling
    references might still be possible unless cache_purge() fixes up
    the children's v_dd pointers appropriately.
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  • Next message: Jeff Roberson: "Re: Freeing vnodes."