/*
* 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);
}
/*
* Calculate the logical to physical mapping if not done already,
* then call the device strategy routine.
*/
int
ufs_strategy(void *v)
{
struct vop_strategy_args /* {
struct vnode *a_vp;
struct buf *a_bp;
} */ *ap = v;
struct buf *bp;
struct vnode *vp;
struct inode *ip;
struct mount *mp;
int error;
bp = ap->a_bp;
vp = ap->a_vp;
ip = VTOI(vp);
if (vp->v_type == VBLK || vp->v_type == VCHR)
panic("ufs_strategy: spec");
KASSERT(bp->b_bcount != 0);
if (bp->b_blkno == bp->b_lblkno) {
error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno,
NULL);
if (error) {
bp->b_error = error;
biodone(bp);
return (error);
}
if (bp->b_blkno == -1) /* no valid data */
clrbuf(bp);
}
if (bp->b_blkno < 0) { /* block is not on disk */
biodone(bp);
return (0);
}
vp = ip->i_devvp;
error = VOP_STRATEGY(vp, bp);
if (error)
return error;
if (!BUF_ISREAD(bp))
return 0;
mp = wapbl_vptomp(vp);
if (mp == NULL || mp->mnt_wapbl_replay == NULL ||
!WAPBL_REPLAY_ISOPEN(mp) ||
!WAPBL_REPLAY_CAN_READ(mp, bp->b_blkno, bp->b_bcount))
return 0;
error = biowait(bp);
if (error)
return error;
error = WAPBL_REPLAY_READ(mp, bp->b_data, bp->b_blkno, bp->b_bcount);
if (error) {
mutex_enter(&bufcache_lock);
SET(bp->b_cflags, BC_INVAL);
mutex_exit(&bufcache_lock);
}
return error;
}
