Esempio n. 1
0
int lv_is_visible(const struct logical_volume *lv)
{
	if (lv->status & SNAPSHOT)
		return 0;

	if (lv_is_cow(lv)) {
		if (lv_is_virtual_origin(origin_from_cow(lv)))
			return 1;

		return lv_is_visible(origin_from_cow(lv));
	}

	return lv->status & VISIBLE_LV ? 1 : 0;
}
Esempio n. 2
0
static int _lvchange_activate(struct cmd_context *cmd, struct logical_volume *lv)
{
	int activate;

	activate = arg_uint_value(cmd, activate_ARG, 0);

	if (lv_is_cow(lv) && !lv_is_virtual_origin(origin_from_cow(lv)))
		lv = origin_from_cow(lv);

	if (activate == CHANGE_AAY) {
		if (!lv_passes_auto_activation_filter(cmd, lv))
			return 1;
		activate = CHANGE_ALY;
	}

	if (activate == CHANGE_ALN) {
		log_verbose("Deactivating logical volume \"%s\" locally",
			    lv->name);
		if (!deactivate_lv_local(cmd, lv))
			return_0;
	} else if (activate == CHANGE_AN) {
		log_verbose("Deactivating logical volume \"%s\"", lv->name);
		if (!deactivate_lv(cmd, lv))
			return_0;
	} else {
		if ((activate == CHANGE_AE) ||
		    lv_is_origin(lv) ||
		    lv_is_thin_type(lv)) {
			log_verbose("Activating logical volume \"%s\" "
				    "exclusively", lv->name);
			if (!activate_lv_excl(cmd, lv))
				return_0;
		} else if (activate == CHANGE_ALY) {
			log_verbose("Activating logical volume \"%s\" locally",
				    lv->name);
			if (!activate_lv_local(cmd, lv))
				return_0;
		} else {
			log_verbose("Activating logical volume \"%s\"",
				    lv->name);
			if (!activate_lv(cmd, lv))
				return_0;
		}

		if (background_polling())
			lv_spawn_background_polling(cmd, lv);
	}

	return 1;
}
Esempio n. 3
0
int lv_is_visible(const struct logical_volume *lv)
{
	if (lv_is_historical(lv))
		return 1;

	if (lv_is_snapshot(lv))
		return 0;

	if (lv_is_cow(lv)) {
		if (lv_is_virtual_origin(origin_from_cow(lv)))
			return 1;

		if (lv_is_merging_cow(lv))
			return 0;

		return lv_is_visible(origin_from_cow(lv));
	}

	return lv->status & VISIBLE_LV ? 1 : 0;
}
Esempio n. 4
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;
}