ufs/ffs/ffs_snapshot.c

90 ffs_snapblkfree(fs, devvp, bno, size, inum, vtype, wkhd)
92 	struct vnode *devvp;
127 ffs_copyonwrite(devvp, bp)
128 	struct vnode *devvp;
176 static void try_free_snapdata(struct vnode *devvp);
177 static struct snapdata *ffs_snapdata_acquire(struct vnode *devvp);
225 	struct vnode *vp, *xvp, *mvp, *devvp;
320 	devvp = ITODEVVP(ip);
506 		if ((error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + loc),
656 	sn = ffs_snapdata_acquire(devvp);
687 		VI_LOCK(devvp);
692 		VI_UNLOCK(devvp);
719 	VI_LOCK(devvp);
725 	devvp->v_vflag |= VV_COPYONWRITE;
726 	VI_UNLOCK(devvp);
854 	VI_LOCK(devvp);
858 	VI_UNLOCK(devvp);
1647 	struct vnode *devvp;
1656 	devvp = ITODEVVP(ip);
1664 	VI_LOCK(devvp);
1666 		sn = devvp->v_rdev->si_snapdata;
1669 		VI_UNLOCK(devvp);
1676 		VI_LOCK(devvp);
1680 		try_free_snapdata(devvp);
1682 		VI_UNLOCK(devvp);
1783 ffs_snapblkfree(fs, devvp, bno, size, inum, vtype, wkhd)
1785 	struct vnode *devvp;
1803 	VI_LOCK(devvp);
1804 	sn = devvp->v_rdev->si_snapdata;
1806 		VI_UNLOCK(devvp);
1810 	    VI_MTX(devvp)) != 0)
2000 	struct vnode *devvp = ump->um_devvp;
2064 		sn = ffs_snapdata_acquire(devvp);
2074 		VI_LOCK(devvp);
2081 		VI_UNLOCK(devvp);
2125 	VI_LOCK(devvp);
2126 	ASSERT_VOP_LOCKED(devvp, "ffs_snapshot_mount");
2129 	devvp->v_vflag |= VV_COPYONWRITE;
2130 	VI_UNLOCK(devvp);
2140 	struct vnode *devvp = VFSTOUFS(mp)->um_devvp;
2145 	VI_LOCK(devvp);
2146 	sn = devvp->v_rdev->si_snapdata;
2152 		    VI_MTX(devvp));
2170 		VI_LOCK(devvp);
2171 		sn = devvp->v_rdev->si_snapdata;
2173 	try_free_snapdata(devvp);
2174 	ASSERT_VOP_LOCKED(devvp, "ffs_snapshot_unmount");
2179  * locked after snaplk. devvp shall be locked on entry, and will be
2183 ffs_bp_snapblk(devvp, bp)
2184 	struct vnode *devvp;
2192 	ASSERT_VI_LOCKED(devvp, "ffs_bp_snapblk");
2193 	KASSERT(devvp->v_type == VCHR, ("Not a device %p", devvp));
2194 	sn = devvp->v_rdev->si_snapdata;
2222 	struct vnode *vp, *devvp;
2231 	devvp = bo2vnode(bo);
2232 	KASSERT(vp == devvp, ("devvp != vp %p %p", bo, bp));
2234 	VI_LOCK(devvp);
2235 	bp_bdskip = ffs_bp_snapblk(devvp, bp);
2238 	VI_UNLOCK(devvp);
2265 				VI_LOCK(devvp);
2267 					VI_UNLOCK(devvp);
2272 				VI_UNLOCK(devvp);
2293 ffs_copyonwrite(devvp, bp)
2294 	struct vnode *devvp;
2308 	if (devvp != bp->b_vp && IS_SNAPSHOT(VTOI(bp->b_vp)))
2316 	VI_LOCK(devvp);
2317 	sn = devvp->v_rdev->si_snapdata;
2320 		VI_UNLOCK(devvp);
2327 		VI_UNLOCK(devvp);
2343 		VI_UNLOCK(devvp);
2360 	    VI_MTX(devvp)) != 0) {
2361 		VI_LOCK(devvp);
2362 		sn = devvp->v_rdev->si_snapdata;
2365 			VI_UNLOCK(devvp);
2434 			if (bp->b_vp == devvp)
2456 			if ((devvp == bp->b_vp || bp->b_vp->v_type == VDIR ||
2469 			if ((devvp == bp->b_vp || bp->b_vp->v_type == VDIR ||
2489 		if ((devvp == bp->b_vp || bp->b_vp->v_type == VDIR ||
2520 	struct vnode *devvp;
2524 	devvp = VFSTOUFS(mp)->um_devvp;
2525 	if ((devvp->v_vflag & VV_COPYONWRITE) == 0)
2528 		VI_LOCK(devvp);
2529 		sn = devvp->v_rdev->si_snapdata;
2531 			VI_UNLOCK(devvp);
2536 		    VI_MTX(devvp)) == 0)
2673 /* Try to free snapdata associated with devvp */
2675 try_free_snapdata(struct vnode *devvp)
2680 	ASSERT_VI_LOCKED(devvp, "try_free_snapdata");
2681 	sn = devvp->v_rdev->si_snapdata;
2684 	    (devvp->v_vflag & VV_COPYONWRITE) == 0) {
2685 		VI_UNLOCK(devvp);
2689 	devvp->v_rdev->si_snapdata = NULL;
2690 	devvp->v_vflag &= ~VV_COPYONWRITE;
2691 	lockmgr(&sn->sn_lock, LK_DRAIN|LK_INTERLOCK, VI_MTX(devvp));
2702 ffs_snapdata_acquire(struct vnode *devvp)
2709 	 * devvp lock to avoid allocation while the devvp interlock is
2715 		VI_LOCK(devvp);
2716 		sn = devvp->v_rdev->si_snapdata;
2728 			sn = devvp->v_rdev->si_snapdata = nsn;
2729 			VI_UNLOCK(devvp);
2739 		    LK_EXCLUSIVE | LK_SLEEPFAIL, VI_MTX(devvp));