lvm2/tools/vgcreate.c

/*
 * Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
 * Copyright (C) 2004-2009 Red Hat, Inc. All rights reserved.
 *
 * This file is part of LVM2.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU Lesser General Public License v.2.1.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "tools.h"

int vgcreate(struct cmd_context *cmd, int argc, char **argv)
{
	struct processing_handle *handle;
	struct pvcreate_params pp;
	struct vgcreate_params vp_new;
	struct vgcreate_params vp_def;
	struct volume_group *vg;
	const char *tag;
	char *vg_name;
	struct arg_value_group_list *current_group;

	if (!argc) {
		log_error("Please provide volume group name and "
			  "physical volumes");
		return EINVALID_CMD_LINE;
	}

	vg_name = argv[0];
	argc--;
	argv++;

	pvcreate_params_set_defaults(&pp);

	if (!pvcreate_params_from_args(cmd, &pp))
		return EINVALID_CMD_LINE;

	pp.pv_count = argc;
	pp.pv_names = argv;

	/* Don't create a new PV on top of an existing PV like pvcreate does. */
	pp.preserve_existing = 1;

	if (!vgcreate_params_set_defaults(cmd, &vp_def, NULL))
		return EINVALID_CMD_LINE;
	vp_def.vg_name = vg_name;
	if (!vgcreate_params_set_from_args(cmd, &vp_new, &vp_def))
		return EINVALID_CMD_LINE;

	if (!vgcreate_params_validate(cmd, &vp_new))
		return EINVALID_CMD_LINE;

	/*
	 * Needed to change the global VG namespace,
	 * and to change the set of orphan PVs.
	 */
	if (!lockd_gl_create(cmd, "ex", vp_new.lock_type))
		return_ECMD_FAILED;
	cmd->lockd_gl_disable = 1;

	/* Check for old md signatures at the end of devices. */
	cmd->use_full_md_check = 1;

	/*
	 * Check if the VG name already exists.  This should be done before
	 * creating PVs on any of the devices.
	 *
	 * When searching if a VG name exists, acquire the VG lock,
	 * then do the initial label scan which reads all devices and
	 * populates lvmcache with any VG name it finds.  If the VG name
	 * we want to use exists, then the label scan will find it,
	 * and the fmt_from_vgname call (used to check if the name exists)
	 * will return non-NULL.
	 */

	if (!lock_vol(cmd, vp_new.vg_name, LCK_VG_WRITE, NULL)) {
		log_error("Can't get lock for %s.", vp_new.vg_name);
		return ECMD_FAILED;
	}

	lvmcache_label_scan(cmd);

	if (lvmcache_fmt_from_vgname(cmd, vp_new.vg_name, NULL, 0)) {
		unlock_vg(cmd, NULL, vp_new.vg_name);
		log_error("A volume group called %s already exists.", vp_new.vg_name);
		return ECMD_FAILED;
	}

	/*
	 * FIXME: we have to unlock/relock the new VG name around the pvcreate
	 * step because pvcreate needs to destroy lvmcache, which doesn't allow
	 * any locks to be held.  There shouldn't be any reason to require this
	 * VG lock to be released, so the lvmcache destroy rule about locks
	 * seems to be unwarranted here.
	 */
	unlock_vg(cmd, NULL, vp_new.vg_name);

	if (!(handle = init_processing_handle(cmd, NULL))) {
		log_error("Failed to initialize processing handle.");
		return ECMD_FAILED;
	}

	if (!pvcreate_each_device(cmd, handle, &pp)) {
		destroy_processing_handle(cmd, handle);
		return_ECMD_FAILED;
	}

	/* Relock the new VG name, see comment above. */
	if (!lock_vol(cmd, vp_new.vg_name, LCK_VG_WRITE, NULL)) {
		destroy_processing_handle(cmd, handle);
		return_ECMD_FAILED;
	}

	/*
	 * pvcreate_each_device returns with the VG_ORPHANS write lock held,
	 * which was used to do pvcreate.  Now to create the VG using those
	 * PVs, the VG lock will be taken (with the orphan lock already held.)
	 */

	if (!(vg = vg_create(cmd, vp_new.vg_name)))
		goto_bad;

	if (vg->fid->fmt->features & FMT_CONFIG_PROFILE)
		vg->profile = vg->cmd->profile_params->global_metadata_profile;

	if (!vg_set_extent_size(vg, vp_new.extent_size) ||
	    !vg_set_max_lv(vg, vp_new.max_lv) ||
	    !vg_set_max_pv(vg, vp_new.max_pv) ||
	    !vg_set_alloc_policy(vg, vp_new.alloc) ||
	    !vg_set_system_id(vg, vp_new.system_id) ||
	    !vg_set_mda_copies(vg, vp_new.vgmetadatacopies))
		goto_bad;

	/* attach the pv's */
	if (!vg_extend_each_pv(vg, &pp))
		goto_bad;

	if (vp_new.max_lv != vg->max_lv)
		log_warn("WARNING: Setting maxlogicalvolumes to %d "
			 "(0 means unlimited)", vg->max_lv);

	if (vp_new.max_pv != vg->max_pv)
		log_warn("WARNING: Setting maxphysicalvolumes to %d "
			 "(0 means unlimited)", vg->max_pv);

	if (arg_is_set(cmd, addtag_ARG)) {
		dm_list_iterate_items(current_group, &cmd->arg_value_groups) {
			if (!grouped_arg_is_set(current_group->arg_values, addtag_ARG))
				continue;

			if (!(tag = grouped_arg_str_value(current_group->arg_values, addtag_ARG, NULL))) {
				log_error("Failed to get tag");
				goto bad;
			}

			if (!vg_change_tag(vg, tag, 1))
				goto_bad;
		}
	}

	if (!archive(vg))
		goto_bad;

	/* Store VG on disk(s) */
	if (!vg_write(vg) || !vg_commit(vg))
		goto_bad;

	/*
	 * The VG is initially written without lock_type set, i.e. it starts as
	 * a local VG.  lockd_init_vg() then writes the VG a second time with
	 * both lock_type and lock_args set.
	 */
	if (!lockd_init_vg(cmd, vg, vp_new.lock_type, 0)) {
		log_error("Failed to initialize lock args for lock type %s",
			  vp_new.lock_type);
		vg_remove_pvs(vg);
		vg_remove_direct(vg);
		goto_bad;
	}

	unlock_vg(cmd, NULL, VG_ORPHANS);
	unlock_vg(cmd, vg, vp_new.vg_name);

	backup(vg);

	log_print_unless_silent("Volume group \"%s\" successfully created%s%s",
				vg->name,
				vg->system_id ? " with system ID " : "", vg->system_id ? : "");

	/*
	 * Start the VG lockspace because it will likely be used right away.
	 * Optionally wait for the start to complete so the VG can be fully
	 * used after this command completes (otherwise, the VG can only be
	 * read without locks until the lockspace is done starting.)
	 */
	if (vg_is_shared(vg)) {
		const char *start_opt = arg_str_value(cmd, lockopt_ARG, NULL);

		if (!lockd_start_vg(cmd, vg, 1)) {
			log_error("Failed to start locking");
			goto out;
		}

		lockd_gl(cmd, "un", 0);

		if (!start_opt || !strcmp(start_opt, "wait")) {
			/* It is OK if the user does Ctrl-C to cancel the wait. */
			log_print_unless_silent("Starting locking.  Waiting until locks are ready...");
			lockd_start_wait(cmd);

		} else if (!strcmp(start_opt, "nowait")) {
			log_print_unless_silent("Starting locking.  VG is read-only until locks are ready.");
		}

	}
out:
	release_vg(vg);
	destroy_processing_handle(cmd, handle);
	return ECMD_PROCESSED;

bad:
	unlock_vg(cmd, vg, vp_new.vg_name);
	unlock_vg(cmd, NULL, VG_ORPHANS);
	release_vg(vg);
	destroy_processing_handle(cmd, handle);
	return ECMD_FAILED;
}