int vg_remove_snapshot(struct logical_volume *cow)
{
	int preload_origin = 0;
	struct logical_volume *origin = origin_from_cow(cow);

	dm_list_del(&cow->snapshot->origin_list);
	origin->origin_count--;

	if (find_merging_cow(origin) == find_cow(cow)) {
		clear_snapshot_merge(origin);
		/*
		 * preload origin IFF "snapshot-merge" target is active
		 * - IMPORTANT: avoids preload if onactivate merge is pending
		 */
		if (lv_has_target_type(origin->vg->cmd->mem, origin, NULL,
				       "snapshot-merge")) {
			/*
			 * preload origin to:
			 * - allow proper release of -cow
			 * - avoid allocations with other devices suspended
			 *   when transitioning from "snapshot-merge" to
			 *   "snapshot-origin after a merge completes.
			 */
			preload_origin = 1;
		}
	}

	if (!lv_remove(cow->snapshot->lv)) {
		log_error("Failed to remove internal snapshot LV %s",
			  cow->snapshot->lv->name);
		return 0;
	}

	cow->snapshot = NULL;
	lv_set_visible(cow);

	if (preload_origin) {
		if (!vg_write(origin->vg))
			return_0;
		if (!suspend_lv(origin->vg->cmd, origin)) {
			log_error("Failed to refresh %s without snapshot.",
				  origin->name);
			return 0;
		}
		if (!vg_commit(origin->vg))
			return_0;
		if (!resume_lv(origin->vg->cmd, origin)) {
			log_error("Failed to resume %s.", origin->name);
			return 0;
		}
	}

	return 1;
}
Beispiel #2
0
int vg_remove_snapshot(struct logical_volume *cow)
{
	int merging_snapshot = 0;
	struct logical_volume *origin = origin_from_cow(cow);
	int is_origin_active = lv_is_active(origin);

	if (is_origin_active &&
	    lv_is_virtual_origin(origin)) {
		if (!deactivate_lv(origin->vg->cmd, origin)) {
			log_error("Failed to deactivate logical volume \"%s\"",
				  origin->name);
			return 0;
		}
		is_origin_active = 0;
	}

	dm_list_del(&cow->snapshot->origin_list);
	origin->origin_count--;

	if (lv_is_merging_origin(origin) &&
	    (find_snapshot(origin) == find_snapshot(cow))) {
		clear_snapshot_merge(origin);
		/*
		 * preload origin IFF "snapshot-merge" target is active
		 * - IMPORTANT: avoids preload if inactivate merge is pending
		 */
		if (lv_has_target_type(origin->vg->vgmem, origin, NULL,
				       TARGET_NAME_SNAPSHOT_MERGE)) {
			/*
			 * preload origin to:
			 * - allow proper release of -cow
			 * - avoid allocations with other devices suspended
			 *   when transitioning from "snapshot-merge" to
			 *   "snapshot-origin after a merge completes.
			 */
			merging_snapshot = 1;
		}
	}

	if (!lv_remove(cow->snapshot->lv)) {
		log_error("Failed to remove internal snapshot LV %s",
			  cow->snapshot->lv->name);
		return 0;
	}

	cow->snapshot = NULL;
	lv_set_visible(cow);

	/* format1 must do the change in one step, with the commit last. */
	if (!(origin->vg->fid->fmt->features & FMT_MDAS)) {
		/* Get the lock for COW volume */
		if (is_origin_active && !activate_lv(cow->vg->cmd, cow)) {
			log_error("Unable to activate logical volume \"%s\"",
				  cow->name);
			return 0;
		}
		return 1;
	}

	if (!vg_write(origin->vg))
		return_0;

	/* Skip call suspend, if device is not active */
	if (is_origin_active && !suspend_lv(origin->vg->cmd, origin)) {
		log_error("Failed to refresh %s without snapshot.",
			  origin->name);
		vg_revert(origin->vg);
		return 0;
	}
	if (!vg_commit(origin->vg))
		return_0;

	if (is_origin_active) {
		/*
		 * If the snapshot was active and the COW LV is taken away
		 * the LV lock on cluster has to be grabbed, so use
		 * activate_lv() which resumes suspend cow device.
		 */
		if (!merging_snapshot && !activate_lv(cow->vg->cmd, cow)) {
			log_error("Failed to activate %s.", cow->name);
			return 0;
		}

		if (!resume_lv(origin->vg->cmd, origin)) {
			log_error("Failed to resume %s.", origin->name);
			return 0;
		}

		/*
		 * For merged snapshot and clustered VG activate cow LV so
		 * the following call to deactivate_lv() can clean-up table
		 * entries. For this clustered lock need to be held.
		 */
		if (vg_is_clustered(cow->vg) &&
		    merging_snapshot && !activate_lv(cow->vg->cmd, cow)) {
			log_error("Failed to activate %s.", cow->name);
			return 0;
		}
	}

	return 1;
}