module/zfs/dsl_dataset.c

321 		/* if (logical birth > prev prev snap txg) prev unique += bs */
966 	/* add '@' if ds is a snap */
2649  * 'snap' should be a buffer of size ZFS_MAX_DATASET_NAME_LEN.
2652 dsl_get_prev_snap(dsl_dataset_t *ds, char *snap)
2656 		dsl_dataset_name(ds->ds_prev, snap);
2890 dsl_dataset_modified_since_snap(dsl_dataset_t *ds, dsl_dataset_t *snap)
2896 	if (snap == NULL)
2901 	if (birth > dsl_dataset_phys(snap)->ds_creation_txg) {
2910 		if (dmu_objset_from_ds(snap, &os_snap) != 0)
3181 	 * Check if the snap we are rolling back to uses more than
3284 	struct promotenode *snap;
3303 	snap = list_head(&ddpa->shared_snaps);
3304 	if (snap == NULL) {
3308 	dsl_dataset_t *const origin_ds = snap->ds;
3330 	snap = list_tail(&ddpa->clone_snaps);
3331 	ASSERT(snap != NULL);
3332 	ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
3334 	dsl_deadlist_space_range(&snap->ds->ds_deadlist,
3358 	for (snap = list_head(&ddpa->shared_snaps); snap;
3359 	    snap = list_next(&ddpa->shared_snaps, snap)) {
3361 		dsl_dataset_t *ds = snap->ds;
3383 			    snap->ds->ds_snapname);
3472 		snap = list_head(&ddpa->origin_snaps);
3473 		if (snap == NULL) {
3478 		    snap->ds->ds_dir->dd_origin_txg, &ddpa->cloneusedsnap);
3483 		    snap->ds->ds_dir->dd_origin_txg, &space);
3508 	struct promotenode *snap;
3523 	snap = list_head(&ddpa->shared_snaps);
3524 	origin_ds = snap->ds;
3527 	snap = list_head(&ddpa->origin_snaps);
3528 	origin_head = snap->ds;
3539 	/* change origin's next snap */
3542 	snap = list_tail(&ddpa->clone_snaps);
3543 	ASSERT3U(dsl_dataset_phys(snap->ds)->ds_prev_snap_obj, ==,
3545 	dsl_dataset_phys(origin_ds)->ds_next_snap_obj = snap->ds->ds_object;
3550 		    snap->ds->ds_object, tx);
3606 	for (snap = list_head(&ddpa->shared_snaps); snap;
3607 	    snap = list_next(&ddpa->shared_snaps, snap)) {
3608 		dsl_dataset_t *ds = snap->ds;
3620 		/* move snap name entry */
3744 		struct promotenode *snap;
3755 		snap = kmem_alloc(sizeof (*snap), KM_SLEEP);
3756 		snap->ds = ds;
3757 		list_insert_tail(l, snap);
3767 	struct promotenode *snap;
3770 	for (snap = list_head(l); snap; snap = list_next(l, snap)) {
3772 		dsl_deadlist_space_range(&snap->ds->ds_deadlist,
3782 	struct promotenode *snap;
3787 	while ((snap = list_remove_tail(l)) != NULL) {
3788 		dsl_dataset_rele(snap->ds, tag);
3789 		kmem_free(snap, sizeof (*snap));
3799 	struct promotenode *snap;
3823 	snap = list_head(&ddpa->shared_snaps);
3824 	ASSERT3U(snap->ds->ds_object, ==, dsl_dir_phys(dd)->dd_origin_obj);
3826 	    dsl_dir_phys(snap->ds->ds_dir)->dd_head_dataset_obj,
3831 	if (dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj != 0) {
3833 		    dsl_dir_phys(snap->ds->ds_dir)->dd_origin_obj,
4603 	dsl_dataset_t *snap = new;
4605 	while (dsl_dataset_phys(snap)->ds_prev_snap_txg >
4609 		dsl_deadlist_space_range(&snap->ds_deadlist,
4616 		uint64_t snapobj = dsl_dataset_phys(snap)->ds_prev_snap_obj;
4617 		if (snap != new)
4618 			dsl_dataset_rele(snap, FTAG);
4619 		err = dsl_dataset_hold_obj(dp, snapobj, FTAG, &snap);
4634 		ASSERT3U(dsl_dataset_phys(snap)->ds_prev_snap_txg, ==,
4637 		dsl_deadlist_space(&snap->ds_deadlist, &used, &comp, &uncomp);
4642 	if (snap != new)
4643 		dsl_dataset_rele(snap, FTAG);
4704  * This is the set of blocks that were born after the snap before firstsnap,
4705  * (birth > firstsnap->prev_snap_txg) and died before the snap after the
4706  * last snap (ie, is on lastsnap->ds_next->ds_deadlist or an earlier deadlist).
4707  * We calculate this by iterating over the relevant deadlists (from the snap
4708  * after lastsnap, backward to the snap after firstsnap), summing up the
4709  * space on the deadlist that was born after the snap before firstsnap.