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- Lock the clearing of v_data so it is safe to inspect it with the

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interlock.

Sponsored by:	Isilon Systems, Inc.
This commit is contained in:
Jeff Roberson 2005-03-17 12:00:05 +00:00
parent 23d15e852d
commit ba73105324
1 changed files with 7 additions and 1 deletions
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8
sys/fs/nullfs/null_vnops.c
View file

@ -627,12 +627,18 @@ null_reclaim(struct vop_reclaim_args *ap)
struct vnode *lowervp = xp->null_lowervp;
struct lock *vnlock;
/*
* Use the interlock to protect the clearing of v_data to
* prevent faults in null_lock().
*/
VI_LOCK(vp);
vp->v_data = NULL;
VI_UNLOCK(vp);
if (lowervp) {
null_hashrem(xp);
vrele(lowervp);
}
vp->v_data = NULL;
vp->v_object = NULL;
vnlock = vp->v_vnlock;
vp->v_vnlock = &vp->v_lock;