86 	struct vnode *devvp,  in ffs_snapblkfree()  argument
117 ffs_copyonwrite(struct vnode *devvp, struct buf *bp)  in ffs_copyonwrite()  argument
162 static void try_free_snapdata(struct vnode *devvp);
164 static struct snapdata *ffs_snapdata_acquire(struct vnode *devvp);
213 	struct vnode *vp, *xvp, *mvp, *devvp;  in ffs_snapshot()  local
308 	devvp = ITODEVVP(ip);  in ffs_snapshot()
499 		if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + loc),  in ffs_snapshot()
670 	sn = ffs_snapdata_acquire(devvp);  in ffs_snapshot()
701 		VI_LOCK(devvp);  in ffs_snapshot()
706 		VI_UNLOCK(devvp);  in ffs_snapshot()
712 	VI_LOCK(devvp);  in ffs_snapshot()
718 	devvp->v_vflag |= VV_COPYONWRITE;  in ffs_snapshot()
719 	VI_UNLOCK(devvp);  in ffs_snapshot()
849 	VI_LOCK(devvp);  in ffs_snapshot()
853 	VI_UNLOCK(devvp);  in ffs_snapshot()
1650 	struct vnode *devvp;  in ffs_snapremove()  local
1659 	devvp = ITODEVVP(ip);  in ffs_snapremove()
1667 	VI_LOCK(devvp);  in ffs_snapremove()
1669 		sn = devvp->v_rdev->si_snapdata;  in ffs_snapremove()
1672 		revert_snaplock(vp, devvp, sn);  in ffs_snapremove()
1673 		try_free_snapdata(devvp);  in ffs_snapremove()
1675 	VI_UNLOCK(devvp);  in ffs_snapremove()
1777 	struct vnode *devvp,  in ffs_snapblkfree()  argument
1795 	VI_LOCK(devvp);  in ffs_snapblkfree()
1796 	sn = devvp->v_rdev->si_snapdata;  in ffs_snapblkfree()
1798 		VI_UNLOCK(devvp);  in ffs_snapblkfree()
1807 	    VI_MTX(devvp)) != 0)  in ffs_snapblkfree()
1997 	struct vnode *devvp = ump->um_devvp;  in ffs_snapshot_mount()  local
2061 		sn = ffs_snapdata_acquire(devvp);  in ffs_snapshot_mount()
2071 		VI_LOCK(devvp);  in ffs_snapshot_mount()
2078 		VI_UNLOCK(devvp);  in ffs_snapshot_mount()
2122 	VI_LOCK(devvp);  in ffs_snapshot_mount()
2125 	devvp->v_vflag |= VV_COPYONWRITE;  in ffs_snapshot_mount()
2126 	VI_UNLOCK(devvp);  in ffs_snapshot_mount()
2135 	struct vnode *devvp = VFSTOUFS(mp)->um_devvp;  in ffs_snapshot_unmount()  local
2140 	VI_LOCK(devvp);  in ffs_snapshot_unmount()
2141 	sn = devvp->v_rdev->si_snapdata;  in ffs_snapshot_unmount()
2147 		    VI_MTX(devvp));  in ffs_snapshot_unmount()
2148 		VI_LOCK(devvp);  in ffs_snapshot_unmount()
2149 		revert_snaplock(vp, devvp, sn);  in ffs_snapshot_unmount()
2152 			VI_UNLOCK(devvp);  in ffs_snapshot_unmount()
2154 			VI_LOCK(devvp);  in ffs_snapshot_unmount()
2156 		sn = devvp->v_rdev->si_snapdata;  in ffs_snapshot_unmount()
2158 	try_free_snapdata(devvp);  in ffs_snapshot_unmount()
2159 	VI_UNLOCK(devvp);  in ffs_snapshot_unmount()
2168 ffs_bp_snapblk(struct vnode *devvp, struct buf *bp)  in ffs_bp_snapblk()  argument
2175 	ASSERT_VI_LOCKED(devvp, "ffs_bp_snapblk");  in ffs_bp_snapblk()
2176 	KASSERT(devvp->v_type == VCHR, ("Not a device %p", devvp));  in ffs_bp_snapblk()
2177 	sn = devvp->v_rdev->si_snapdata;  in ffs_bp_snapblk()
2203 	struct vnode *vp, *devvp;  in ffs_bdflush()  local
2212 	devvp = bo2vnode(bo);  in ffs_bdflush()
2213 	KASSERT(vp == devvp, ("devvp != vp %p %p", bo, bp));  in ffs_bdflush()
2215 	VI_LOCK(devvp);  in ffs_bdflush()
2216 	bp_bdskip = ffs_bp_snapblk(devvp, bp);  in ffs_bdflush()
2219 	VI_UNLOCK(devvp);  in ffs_bdflush()
2246 				VI_LOCK(devvp);  in ffs_bdflush()
2248 					VI_UNLOCK(devvp);  in ffs_bdflush()
2253 				VI_UNLOCK(devvp);  in ffs_bdflush()
2274 ffs_copyonwrite(struct vnode *devvp, struct buf *bp)  in ffs_copyonwrite()  argument
2287 	if (devvp != bp->b_vp && IS_SNAPSHOT(VTOI(bp->b_vp)))  in ffs_copyonwrite()
2295 	VI_LOCK(devvp);  in ffs_copyonwrite()
2296 	sn = devvp->v_rdev->si_snapdata;  in ffs_copyonwrite()
2299 		VI_UNLOCK(devvp);  in ffs_copyonwrite()
2306 		VI_UNLOCK(devvp);  in ffs_copyonwrite()
2322 		VI_UNLOCK(devvp);  in ffs_copyonwrite()
2339 	    VI_MTX(devvp)) != 0) {  in ffs_copyonwrite()
2340 		VI_LOCK(devvp);  in ffs_copyonwrite()
2341 		sn = devvp->v_rdev->si_snapdata;  in ffs_copyonwrite()
2344 			VI_UNLOCK(devvp);  in ffs_copyonwrite()
2412 			if (bp->b_vp == devvp)  in ffs_copyonwrite()
2434 			if ((devvp == bp->b_vp || bp->b_vp->v_type == VDIR ||  in ffs_copyonwrite()
2447 			if ((devvp == bp->b_vp || bp->b_vp->v_type == VDIR ||  in ffs_copyonwrite()
2467 		if ((devvp == bp->b_vp || bp->b_vp->v_type == VDIR ||  in ffs_copyonwrite()
2494 	struct vnode *devvp;  in ffs_sync_snap()  local
2498 	devvp = VFSTOUFS(mp)->um_devvp;  in ffs_sync_snap()
2499 	if ((devvp->v_vflag & VV_COPYONWRITE) == 0)  in ffs_sync_snap()
2502 		VI_LOCK(devvp);  in ffs_sync_snap()
2503 		sn = devvp->v_rdev->si_snapdata;  in ffs_sync_snap()
2505 			VI_UNLOCK(devvp);  in ffs_sync_snap()
2510 		    VI_MTX(devvp)) == 0)  in ffs_sync_snap()
2642 try_free_snapdata(struct vnode *devvp)  in try_free_snapdata()  argument
2647 	ASSERT_VI_LOCKED(devvp, "try_free_snapdata");  in try_free_snapdata()
2648 	sn = devvp->v_rdev->si_snapdata;  in try_free_snapdata()
2651 	    (devvp->v_vflag & VV_COPYONWRITE) == 0)  in try_free_snapdata()
2654 	devvp->v_rdev->si_snapdata = NULL;  in try_free_snapdata()
2655 	devvp->v_vflag &= ~VV_COPYONWRITE;  in try_free_snapdata()
2656 	lockmgr(&sn->sn_lock, LK_DRAIN|LK_INTERLOCK, VI_MTX(devvp));  in try_free_snapdata()
2664 	VI_LOCK(devvp);  in try_free_snapdata()
2676 	struct vnode *devvp,  in revert_snaplock()  argument
2681 	ASSERT_VI_LOCKED(devvp, "revert_snaplock");  in revert_snaplock()
2689 		    LK_INTERLOCK, VI_MTX(devvp)) != 0) {  in revert_snaplock()
2693 			    VI_MTX(devvp));  in revert_snaplock()
2695 		VI_LOCK(devvp);  in revert_snaplock()
2706 ffs_snapdata_acquire(struct vnode *devvp)  in ffs_snapdata_acquire()  argument
2719 		VI_LOCK(devvp);  in ffs_snapdata_acquire()
2720 		sn = devvp->v_rdev->si_snapdata;  in ffs_snapdata_acquire()
2732 			sn = devvp->v_rdev->si_snapdata = nsn;  in ffs_snapdata_acquire()
2733 			VI_UNLOCK(devvp);  in ffs_snapdata_acquire()
2743 		    LK_EXCLUSIVE | LK_SLEEPFAIL, VI_MTX(devvp));  in ffs_snapdata_acquire()