/*
* Check that the vnode is still valid, and if so
* acquire requested lock.
*/
int
vn_lock(struct vnode *vp, int flags)
{
int error;
#if 0
KASSERT(vp->v_usecount > 0 || (vp->v_iflag & VI_ONWORKLST) != 0);
#endif
KASSERT((flags & ~(LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY)) == 0);
KASSERT(!mutex_owned(vp->v_interlock));
#ifdef DIAGNOSTIC
if (wapbl_vphaswapbl(vp))
WAPBL_JUNLOCK_ASSERT(wapbl_vptomp(vp));
#endif
error = VOP_LOCK(vp, flags);
if ((flags & LK_RETRY) != 0 && error == ENOENT)
error = VOP_LOCK(vp, flags);
KASSERT((flags & LK_RETRY) == 0 || (flags & LK_NOWAIT) != 0 ||
error == 0);
return error;
}
/*
* Check that the vnode is still valid, and if so
* acquire requested lock.
*/
int
vn_lock(struct vnode *vp, int flags)
{
int error;
#if 0
KASSERT(vp->v_usecount > 0 || (vp->v_iflag & VI_ONWORKLST) != 0);
#endif
KASSERT((flags & ~(LK_SHARED|LK_EXCLUSIVE|LK_NOWAIT|LK_RETRY)) == 0);
KASSERT(!mutex_owned(vp->v_interlock));
#ifdef DIAGNOSTIC
if (wapbl_vphaswapbl(vp))
WAPBL_JUNLOCK_ASSERT(wapbl_vptomp(vp));
#endif
do {
/*
* XXX PR 37706 forced unmount of file systems is unsafe.
* Race between vclean() and this the remaining problem.
*/
mutex_enter(vp->v_interlock);
if (vp->v_iflag & VI_XLOCK) {
if (flags & LK_NOWAIT) {
mutex_exit(vp->v_interlock);
return EBUSY;
}
vwait(vp, VI_XLOCK);
mutex_exit(vp->v_interlock);
error = ENOENT;
} else {
mutex_exit(vp->v_interlock);
error = VOP_LOCK(vp, (flags & ~LK_RETRY));
if (error == 0 || error == EDEADLK || error == EBUSY)
return (error);
}
} while (flags & LK_RETRY);
return (error);
}