lvm2/tools/lvconvert.c

/*
 * Copyright (C) 2005-2016 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"

#include "polldaemon.h"
#include "lv_alloc.h"
#include "lvconvert_poll.h"

struct lvconvert_params {
	int cache;
	int force;
	int snapshot;
	int split;
	int splitcache;
	int splitsnapshot;
	int merge;
	int merge_mirror;
	int poolmetadataspare;
	int repair;
	int thin;
	int uncache;
	int yes;
	int zero;

	const char *lv_name;
	const char *lv_split_name;
	const char *lv_name_full;
	const char *vg_name;
	int wait_completion;
	int need_polling;

	int thin_chunk_size_calc_policy;
	uint32_t chunk_size;
	uint32_t region_size;

	uint32_t mirrors;
	sign_t mirrors_sign;
	uint32_t keep_mimages;
	uint32_t stripes;
	uint32_t stripe_size;
	uint32_t read_ahead;
	const char *cache_mode; /* cache */
	const char *policy_name; /* cache */
	struct dm_config_tree *policy_settings; /* cache */

	const struct segment_type *segtype;
	unsigned target_attr;

	alloc_policy_t alloc;

	int pv_count;
	char **pvs;
	struct dm_list *pvh;

	int replace_pv_count;
	char **replace_pvs;
	struct dm_list *replace_pvh;

	struct logical_volume *lv_to_poll;
	struct dm_list idls;

	uint32_t pool_metadata_extents;
	int passed_args;
	uint64_t pool_metadata_size;
	const char *origin_name;
	const char *pool_data_name;
	struct logical_volume *pool_data_lv;
	const char *pool_metadata_name;
	struct logical_volume *pool_metadata_lv;
	thin_discards_t discards;
};

struct convert_poll_id_list {
	struct dm_list list;
	struct poll_operation_id *id;
	unsigned is_merging_origin:1;
	unsigned is_merging_origin_thin:1;
};

static int _lvconvert_validate_names(struct lvconvert_params *lp)
{
	unsigned i, j;
	const char *names[] = {
		(lp->lv_name == lp->pool_data_name) ? NULL : lp->lv_name, "converted",
		lp->pool_data_name, "pool",
		lp->pool_metadata_name, "pool metadata",
		lp->origin_name, "origin",
	};

	for (i = 0; i < DM_ARRAY_SIZE(names); i += 2)
		if (names[i])
			for (j = i + 2; j < DM_ARRAY_SIZE(names); j += 2)
				if (names[j] && !strcmp(names[i], names[j])) {
					log_error("Can't use same name %s for %s and %s volume.",
						  names[i], names[i + 1], names[j + 1]);
					return 0;
				}

	return 1;
}

static int _lvconvert_name_params(struct lvconvert_params *lp,
				  struct cmd_context *cmd,
				  int *pargc, char ***pargv)
{
	if (lp->merge) {
		if (!*pargc) {
			log_error("Please specify a logical volume path.");
			return 0;
		}
		return 1;
	}

	if (!*pargc) {
		if (lp->cache) {
			log_error("Logical volume name for caching is missing.");
			return 0;
		}
		if (lp->thin) {
			log_error("Please specify a logical volume to act as "
				  "the external origin.");
			return 0;
		}
		if (lp->snapshot) {
			log_error("Please specify a logical volume to act as "
				  "the snapshot exception store.");
			return 0;
		}
		if (lp->split) {
			log_error("Logical volume for split is missing.");
			return 0;
		}
		if (lp->splitcache) {
			log_error("Cache logical volume for split is missing.");
			return 0;
		}
		if (lp->uncache) {
			log_error("Cache logical volume for uncache is missing.");
			return 0;
		}
		if (!lp->lv_name_full) {
			log_error("Please provide logical volume path.");
			return 0;
		}
	} else if (!lp->lv_name_full) {
		lp->lv_name_full = (*pargv)[0];
		(*pargv)++, (*pargc)--;
	}

	if (!validate_restricted_lvname_param(cmd, &lp->vg_name, &lp->pool_metadata_name))
		return_0;

	if (!validate_restricted_lvname_param(cmd, &lp->vg_name, &lp->pool_data_name))
		return_0;

	if (!validate_restricted_lvname_param(cmd, &lp->vg_name, &lp->origin_name))
		return_0;

	if (!validate_restricted_lvname_param(cmd, &lp->vg_name, &lp->lv_split_name))
		return_0;

	if (!lp->vg_name && !strchr(lp->lv_name_full, '/')) {
		/* Check for $LVM_VG_NAME */
		if (!(lp->vg_name = extract_vgname(cmd, NULL))) {
			log_error("Please specify a logical volume path.");
			return 0;
		}
	}

	if (!validate_lvname_param(cmd, &lp->vg_name, &lp->lv_name_full))
		return_0;

	lp->lv_name = lp->lv_name_full;

	if (!validate_name(lp->vg_name)) {
		log_error("Please provide a valid volume group name");
		return 0;
	}

	if (!lp->merge_mirror &&
	    !lp->repair &&
	    !arg_count(cmd, splitmirrors_ARG) &&
	    !strstr(lp->lv_name, "_tdata") &&
	    !strstr(lp->lv_name, "_tmeta") &&
	    !strstr(lp->lv_name, "_cdata") &&
	    !strstr(lp->lv_name, "_cmeta") &&
	    !apply_lvname_restrictions(lp->lv_name))
		return_0;

	if (*pargc) {
		if (lp->snapshot) {
			log_error("Too many arguments provided for snapshots.");
			return 0;
		}
		if (lp->splitsnapshot) {
			log_error("Too many arguments provided with --splitsnapshot.");
			return 0;
		}
		if (lp->splitcache) {
			log_error("Too many arguments provided with --splitcache.");
			return 0;
		}
		if (lp->split) {
			log_error("Too many arguments provided with --split.");
			return 0;
		}
		if (lp->uncache) {
			log_error("Too many arguments provided with --uncache.");
			return 0;
		}
		if (lp->pool_data_name && lp->pool_metadata_name) {
			log_error("Too many arguments provided for pool.");
			return 0;
		}
	}

	if (!_lvconvert_validate_names(lp))
		return_0;

	return 1;
}

static int _check_conversion_type(struct cmd_context *cmd, const char *type_str)
{
	if (!type_str || !*type_str)
		return 1;

	if (!strcmp(type_str, "mirror")) {
		if (!arg_count(cmd, mirrors_ARG)) {
			log_error("Conversions to --type mirror require -m/--mirrors");
			return 0;
		}
		return 1;
	}

	/* FIXME: Check thin-pool and thin more thoroughly! */
	if (!strcmp(type_str, "snapshot") ||
	    !strncmp(type_str, "raid", 4) ||
	    !strcmp(type_str, "cache-pool") || !strcmp(type_str, "cache") ||
	    !strcmp(type_str, "thin-pool") || !strcmp(type_str, "thin"))
		return 1;

	log_error("Conversion using --type %s is not supported.", type_str);
	return 0;
}

/* -s/--snapshot and --type snapshot are synonyms */
static int _snapshot_type_requested(struct cmd_context *cmd, const char *type_str) {
	return (arg_count(cmd, snapshot_ARG) || !strcmp(type_str, "snapshot"));
}
/* mirror/raid* (1,10,4,5,6 and their variants) reshape */
static int _mirror_or_raid_type_requested(struct cmd_context *cmd, const char *type_str) {
	return (arg_count(cmd, mirrors_ARG) || !strncmp(type_str, "raid", 4) || !strcmp(type_str, "mirror"));
}

static int _read_pool_params(struct cmd_context *cmd, int *pargc, char ***pargv,
			     const char *type_str, struct lvconvert_params *lp)
{
	int cachepool = 0;
	int thinpool = 0;

	if ((lp->pool_data_name = arg_str_value(cmd, cachepool_ARG, NULL))) {
		if (type_str[0] &&
		    strcmp(type_str, "cache") &&
		    strcmp(type_str, "cache-pool")) {
			log_error("--cachepool argument is only valid with "
				  " the cache or cache-pool segment type.");
			return 0;
		}
		cachepool = 1;
		type_str = "cache-pool";
	} else if (!strcmp(type_str, "cache-pool"))
		cachepool = 1;
	else if ((lp->pool_data_name = arg_str_value(cmd, thinpool_ARG, NULL))) {
		if (type_str[0] &&
		    strcmp(type_str, "thin") &&
		    strcmp(type_str, "thin-pool")) {
			log_error("--thinpool argument is only valid with "
				  " the thin or thin-pool segment type.");
			return 0;
		}
		thinpool = 1;
		type_str = "thin-pool";
	} else if (!strcmp(type_str, "thin-pool"))
		thinpool = 1;

	if (lp->cache && !cachepool) {
		log_error("--cache requires --cachepool.");
		return 0;
	}
	if ((lp->cache || cachepool) &&
	    !get_cache_params(cmd, &lp->cache_mode, &lp->policy_name, &lp->policy_settings)) {
		log_error("Failed to parse cache policy and/or settings.");
		return 0;
	}

	if (thinpool) {
		lp->discards = (thin_discards_t) arg_uint_value(cmd, discards_ARG, THIN_DISCARDS_PASSDOWN);
		lp->origin_name = arg_str_value(cmd, originname_ARG, NULL);
	} else {
		if (arg_from_list_is_set(cmd, "is valid only with thin pools",
					 discards_ARG, originname_ARG, thinpool_ARG,
					 zero_ARG, -1))
			return_0;
		if (lp->thin) {
			log_error("--thin requires --thinpool.");
			return 0;
		}
	}

	if (thinpool || cachepool) {
		if (arg_from_list_is_set(cmd, "is invalid with pools",
					 merge_ARG, mirrors_ARG, repair_ARG, snapshot_ARG,
					 splitmirrors_ARG, splitsnapshot_ARG, -1))
			return_0;

		if (!(lp->segtype = get_segtype_from_string(cmd, type_str)))
			return_0;

		if (!get_pool_params(cmd, lp->segtype, &lp->passed_args,
				     &lp->pool_metadata_size,
				     &lp->poolmetadataspare,
				     &lp->chunk_size, &lp->discards,
				     &lp->zero))
			return_0;

		if ((lp->pool_metadata_name = arg_str_value(cmd, poolmetadata_ARG, NULL)) &&
		    arg_from_list_is_set(cmd, "is invalid with --poolmetadata",
					 stripesize_ARG, stripes_long_ARG,
					 readahead_ARG, -1))
			return_0;

		if (!lp->pool_data_name) {
			if (!*pargc) {
				log_error("Please specify the pool data LV.");
				return 0;
			}
			lp->pool_data_name = (*pargv)[0];
			(*pargv)++, (*pargc)--;
		}

		if (!lp->thin && !lp->cache)
			lp->lv_name_full = lp->pool_data_name;

		/* Hmm _read_activation_params */
		lp->read_ahead = arg_uint_value(cmd, readahead_ARG,
						cmd->default_settings.read_ahead);

	} else if (arg_from_list_is_set(cmd, "is valid only with pools",
					poolmetadatasize_ARG, poolmetadataspare_ARG,
					-1))
		return_0;

	return 1;
}

static int _read_params(struct cmd_context *cmd, int argc, char **argv,
			struct lvconvert_params *lp)
{
	int i;
	const char *tmp_str;
	struct arg_value_group_list *group;
	int region_size;
	int pagesize = lvm_getpagesize();
	const char *type_str = arg_str_value(cmd, type_ARG, "");

	if (!_check_conversion_type(cmd, type_str))
		return_0;

	if (arg_count(cmd, repair_ARG)) {
		if (arg_outside_list_is_set(cmd, "cannot be used with --repair",
					    repair_ARG,
					    alloc_ARG, usepolicies_ARG,
					    stripes_long_ARG, stripesize_ARG,
					    force_ARG, noudevsync_ARG, test_ARG,
					    -1))
			return_0;
		lp->repair = 1;
	}

	if (arg_is_set(cmd, mirrorlog_ARG) && arg_is_set(cmd, corelog_ARG)) {
		log_error("--mirrorlog and --corelog are incompatible.");
		return 0;
	}

	if (arg_is_set(cmd, split_ARG)) {
		if (arg_outside_list_is_set(cmd, "cannot be used with --split",
					    split_ARG,
					    name_ARG,
					    force_ARG, noudevsync_ARG, test_ARG,
					    -1))
			return_0;
		lp->split = 1;
	}

	if (arg_is_set(cmd, splitcache_ARG)) {
		if (arg_outside_list_is_set(cmd, "cannot be used with --splitcache",
					    splitcache_ARG,
					    force_ARG, noudevsync_ARG, test_ARG,
					    -1))
			return_0;
		lp->splitcache = 1;
	}

	if (arg_is_set(cmd, splitsnapshot_ARG)) {
		if (arg_outside_list_is_set(cmd, "cannot be used with --splitsnapshot",
					    splitsnapshot_ARG,
					    force_ARG, noudevsync_ARG, test_ARG,
					    -1))
			return_0;
		lp->splitsnapshot = 1;
	}

	if (arg_is_set(cmd, uncache_ARG)) {
		if (arg_outside_list_is_set(cmd, "cannot be used with --uncache",
					    uncache_ARG,
					    force_ARG, noudevsync_ARG, test_ARG,
					    -1))
			return_0;
		lp->uncache = 1;
	}

	if ((_snapshot_type_requested(cmd, type_str) || arg_count(cmd, merge_ARG)) &&
	    (arg_count(cmd, mirrorlog_ARG) || _mirror_or_raid_type_requested(cmd, type_str) ||
	     lp->repair || arg_count(cmd, thinpool_ARG))) {
		log_error("--snapshot/--type snapshot or --merge argument "
			  "cannot be mixed with --mirrors/--type mirror/--type raid*, "
			  "--mirrorlog, --repair or --thinpool.");
		return 0;
	}

	if ((arg_count(cmd, stripes_long_ARG) || arg_count(cmd, stripesize_ARG)) &&
	    !(_mirror_or_raid_type_requested(cmd, type_str) ||
	      lp->repair ||
	      arg_count(cmd, thinpool_ARG))) {
		log_error("--stripes or --stripesize argument is only valid "
			  "with --mirrors/--type mirror/--type raid*, --repair and --thinpool");
		return 0;
	}

	if (arg_count(cmd, cache_ARG))
		lp->cache = 1;

	if (!strcmp(type_str, "cache"))
		lp->cache = 1;
	else if (lp->cache) {
		if (type_str[0]) {
			log_error("--cache is incompatible with --type %s", type_str);
			return 0;
		}
		type_str = "cache";
	}

	if (arg_count(cmd, thin_ARG))
		lp->thin = 1;

	if (!strcmp(type_str, "thin"))
		lp->thin = 1;
	else if (lp->thin) {
		if (type_str[0]) {
			log_error("--thin is incompatible with --type %s", type_str);
			return 0;
		}
		type_str = "thin";
	}

	if (!_read_pool_params(cmd, &argc, &argv, type_str, lp))
		return_0;

	if (!arg_count(cmd, background_ARG))
		lp->wait_completion = 1;

	if (_snapshot_type_requested(cmd, type_str)) {
		if (arg_count(cmd, merge_ARG)) {
			log_error("--snapshot and --merge are mutually exclusive.");
			return 0;
		}

		lp->snapshot = 1;
	}

	if (lp->split) {
		lp->lv_split_name = arg_str_value(cmd, name_ARG, NULL);
	/*
	 * The '--splitmirrors n' argument is equivalent to '--mirrors -n'
	 * (note the minus sign), except that it signifies the additional
	 * intent to keep the mimage that is detached, rather than
	 * discarding it.
	 */
	} else if (arg_count(cmd, splitmirrors_ARG)) {
		if (_mirror_or_raid_type_requested(cmd, type_str)) {
			log_error("--mirrors/--type mirror/--type raid* and --splitmirrors are "
				  "mutually exclusive.");
			return 0;
		}
		if (!arg_count(cmd, name_ARG) &&
		    !arg_count(cmd, trackchanges_ARG)) {
			log_error("Please name the new logical volume using '--name'");
			return 0;
		}

		lp->lv_split_name = arg_str_value(cmd, name_ARG, NULL);
		lp->keep_mimages = 1;
		lp->mirrors = arg_uint_value(cmd, splitmirrors_ARG, 0);
		lp->mirrors_sign = SIGN_MINUS;
	} else if (arg_count(cmd, name_ARG)) {
		log_error("The 'name' argument is only valid"
			  " with --splitmirrors");
		return 0;
	}

	if (arg_count(cmd, merge_ARG)) {
		if ((argc == 1) && strstr(argv[0], "_rimage_"))
			lp->merge_mirror = 1;
		else
			lp->merge = 1;
	}

	if (arg_count(cmd, mirrors_ARG)) {
		/*
		 * --splitmirrors has been chosen as the mechanism for
		 * specifying the intent of detaching and keeping a mimage
		 * versus an additional qualifying argument being added here.
		 */
		lp->mirrors = arg_uint_value(cmd, mirrors_ARG, 0);
		lp->mirrors_sign = arg_sign_value(cmd, mirrors_ARG, SIGN_NONE);
	}

	lp->alloc = (alloc_policy_t) arg_uint_value(cmd, alloc_ARG, ALLOC_INHERIT);

	/* There are six types of lvconvert. */
	if (lp->merge) {	/* Snapshot merge */
		if (arg_outside_list_is_set(cmd, "cannot be used with --merge",
					    merge_ARG,
					    background_ARG, interval_ARG,
					    force_ARG, noudevsync_ARG, test_ARG,
					    -1))
			return_0;

		if (!(lp->segtype = get_segtype_from_string(cmd, SEG_TYPE_NAME_SNAPSHOT)))
			return_0;
	} else if (lp->splitsnapshot)	/* Destroy snapshot retaining cow as separate LV */
		;
	else if (lp->snapshot) {	/* Snapshot creation from pre-existing cow */
		if (!argc) {
			log_error("Please provide logical volume path for snapshot origin.");
			return 0;
		}
		lp->origin_name = argv[0];
		argv++, argc--;

		if (arg_count(cmd, regionsize_ARG)) {
			log_error("--regionsize is only available with mirrors");
			return 0;
		}

		if (arg_count(cmd, stripesize_ARG) || arg_count(cmd, stripes_long_ARG)) {
			log_error("--stripes and --stripesize are only available with striped mirrors");
			return 0;
		}

		if (arg_count(cmd, chunksize_ARG) &&
		    (arg_sign_value(cmd, chunksize_ARG, SIGN_NONE) == SIGN_MINUS)) {
			log_error("Negative chunk size is invalid.");
			return 0;
		}

		lp->chunk_size = arg_uint_value(cmd, chunksize_ARG, 8);
		if (lp->chunk_size < 8 || lp->chunk_size > 1024 ||
		    (lp->chunk_size & (lp->chunk_size - 1))) {
			log_error("Chunk size must be a power of 2 in the "
				  "range 4K to 512K");
			return 0;
		}
		log_verbose("Setting chunk size to %s.", display_size(cmd, lp->chunk_size));

		if (!(lp->segtype = get_segtype_from_string(cmd, SEG_TYPE_NAME_SNAPSHOT)))
			return_0;

		lp->zero = (lp->segtype->flags & SEG_CANNOT_BE_ZEROED)
			? 0 : arg_int_value(cmd, zero_ARG, 1);

	} else if (arg_count(cmd, replace_ARG)) { /* RAID device replacement */
		lp->replace_pv_count = arg_count(cmd, replace_ARG);
		lp->replace_pvs = dm_pool_alloc(cmd->mem, sizeof(char *) * lp->replace_pv_count);
		if (!lp->replace_pvs)
			return_0;

		i = 0;
		dm_list_iterate_items(group, &cmd->arg_value_groups) {
			if (!grouped_arg_is_set(group->arg_values, replace_ARG))
				continue;
			if (!(tmp_str = grouped_arg_str_value(group->arg_values,
							      replace_ARG,
							      NULL))) {
				log_error("Failed to get '--replace' argument");
				return 0;
			}
			if (!(lp->replace_pvs[i++] = dm_pool_strdup(cmd->mem,
								    tmp_str)))
				return_0;
		}
	} else if (_mirror_or_raid_type_requested(cmd, type_str) ||
		   arg_is_set(cmd, repair_ARG) ||
		   arg_is_set(cmd, mirrorlog_ARG) ||
		   arg_is_set(cmd, corelog_ARG)) { /* Mirrors (and some RAID functions) */
		if (arg_count(cmd, chunksize_ARG)) {
			log_error("--chunksize is only available with snapshots or pools.");
			return 0;
		}

		if (arg_count(cmd, zero_ARG)) {
			log_error("--zero is only available with snapshots or thin pools.");
			return 0;
		}

		/*
		 * --regionsize is only valid if converting an LV into a mirror.
		 * Checked when we know the state of the LV being converted.
		 */

		if (arg_count(cmd, regionsize_ARG)) {
			if (arg_sign_value(cmd, regionsize_ARG, SIGN_NONE) ==
				    SIGN_MINUS) {
				log_error("Negative regionsize is invalid");
				return 0;
			}
			lp->region_size = arg_uint_value(cmd, regionsize_ARG, 0);
		} else {
			region_size = get_default_region_size(cmd);
			if (region_size < 0) {
				log_error("Negative regionsize in "
					  "configuration file is invalid");
				return 0;
			}
			lp->region_size = region_size;
		}

		if (lp->region_size % (pagesize >> SECTOR_SHIFT)) {
			log_error("Region size (%" PRIu32 ") must be "
				  "a multiple of machine memory "
				  "page size (%d)",
				  lp->region_size, pagesize >> SECTOR_SHIFT);
			return 0;
		}

		if (lp->region_size & (lp->region_size - 1)) {
			log_error("Region size (%" PRIu32
				  ") must be a power of 2", lp->region_size);
			return 0;
		}

		if (!lp->region_size) {
			log_error("Non-zero region size must be supplied.");
			return 0;
		}

		/* Default is never striped, regardless of existing LV configuration. */
		if (!get_stripe_params(cmd, &lp->stripes, &lp->stripe_size))
			return_0;

		if (arg_count(cmd, mirrors_ARG) && !lp->mirrors) {
			/* down-converting to linear/stripe? */
			if (!(lp->segtype =
			      get_segtype_from_string(cmd, SEG_TYPE_NAME_STRIPED)))
				return_0;
		} else if (arg_count(cmd, type_ARG)) {
			/* changing mirror type? */
			if (!(lp->segtype = get_segtype_from_string(cmd, arg_str_value(cmd, type_ARG, find_config_tree_str(cmd, global_mirror_segtype_default_CFG, NULL)))))
				return_0;
		} /* else segtype will default to current type */
	}

	lp->force = arg_count(cmd, force_ARG);
	lp->yes = arg_count(cmd, yes_ARG);

	if (activation() && lp->segtype && lp->segtype->ops->target_present &&
	    !lp->segtype->ops->target_present(cmd, NULL, &lp->target_attr)) {
		log_error("%s: Required device-mapper target(s) not "
			  "detected in your kernel", lp->segtype->name);
		return 0;
	}

	if (!_lvconvert_name_params(lp, cmd, &argc, &argv))
		return_0;

	lp->pv_count = argc;
	lp->pvs = argv;

	return 1;
}

static struct poll_functions _lvconvert_mirror_fns = {
	.poll_progress = poll_mirror_progress,
	.finish_copy = lvconvert_mirror_finish,
};

static struct poll_functions _lvconvert_merge_fns = {
	.poll_progress = poll_merge_progress,
	.finish_copy = lvconvert_merge_finish,
};

static struct poll_functions _lvconvert_thin_merge_fns = {
	.poll_progress = poll_thin_merge_progress,
	.finish_copy = lvconvert_merge_finish,
};

static struct poll_operation_id *_create_id(struct cmd_context *cmd,
					    const char *vg_name,
					    const char *lv_name,
					    const char *uuid)
{
	struct poll_operation_id *id;
	char lv_full_name[NAME_LEN];

	if (!vg_name || !lv_name || !uuid) {
		log_error(INTERNAL_ERROR "Wrong params for lvconvert _create_id.");
		return NULL;
	}

	if (dm_snprintf(lv_full_name, sizeof(lv_full_name), "%s/%s", vg_name, lv_name) < 0) {
		log_error(INTERNAL_ERROR "Name \"%s/%s\" is too long.", vg_name, lv_name);
		return NULL;
	}

	if (!(id = dm_pool_alloc(cmd->mem, sizeof(*id)))) {
		log_error("Poll operation ID allocation failed.");
		return NULL;
	}

	if (!(id->display_name = dm_pool_strdup(cmd->mem, lv_full_name)) ||
	    !(id->lv_name = strchr(id->display_name, '/')) ||
	    !(id->vg_name = dm_pool_strdup(cmd->mem, vg_name)) ||
	    !(id->uuid = dm_pool_strdup(cmd->mem, uuid))) {
		log_error("Failed to copy one or more poll operation ID members.");
		dm_pool_free(cmd->mem, id);
		return NULL;
	}

	id->lv_name++; /* skip over '/' */

	return id;
}

static int _lvconvert_poll_by_id(struct cmd_context *cmd, struct poll_operation_id *id,
				 unsigned background,
				 int is_merging_origin,
				 int is_merging_origin_thin)
{
	if (test_mode())
		return ECMD_PROCESSED;

	if (is_merging_origin)
		return poll_daemon(cmd, background,
				(MERGING | (is_merging_origin_thin ? THIN_VOLUME : SNAPSHOT)),
				is_merging_origin_thin ? &_lvconvert_thin_merge_fns : &_lvconvert_merge_fns,
				"Merged", id);
	else
		return poll_daemon(cmd, background, CONVERTING,
				&_lvconvert_mirror_fns, "Converted", id);
}

int lvconvert_poll(struct cmd_context *cmd, struct logical_volume *lv,
		   unsigned background)
{
	int r;
	struct poll_operation_id *id = _create_id(cmd, lv->vg->name, lv->name, lv->lvid.s);
	int is_merging_origin = 0;
	int is_merging_origin_thin = 0;

	if (!id) {
		log_error("Failed to allocate poll identifier for lvconvert.");
		return ECMD_FAILED;
	}

	/* FIXME: check this in polling instead */
	if (lv_is_merging_origin(lv)) {
		is_merging_origin = 1;
		is_merging_origin_thin = seg_is_thin_volume(find_snapshot(lv));
	}

	r = _lvconvert_poll_by_id(cmd, id, background, is_merging_origin, is_merging_origin_thin);

	return r;
}

static int _insert_lvconvert_layer(struct cmd_context *cmd,
				   struct logical_volume *lv)
{
	char format[NAME_LEN], layer_name[NAME_LEN];
	int i;

	/*
	 * We would like to give the same number for this layer
	 * and the newly added mimage.
	 * However, LV name of newly added mimage is determined *after*
	 * the LV name of this layer is determined.
	 *
	 * So, use generate_lv_name() to generate mimage name first
	 * and take the number from it.
	 */

	if (dm_snprintf(format, sizeof(format), "%s_mimage_%%d", lv->name) < 0) {
		log_error("lvconvert: layer name creation failed.");
		return 0;
	}

	if (!generate_lv_name(lv->vg, format, layer_name, sizeof(layer_name)) ||
	    sscanf(layer_name, format, &i) != 1) {
		log_error("lvconvert: layer name generation failed.");
		return 0;
	}

	if (dm_snprintf(layer_name, sizeof(layer_name), MIRROR_SYNC_LAYER "_%d", i) < 0) {
		log_error("layer name creation failed.");
		return 0;
	}

	if (!insert_layer_for_lv(cmd, lv, 0, layer_name)) {
		log_error("Failed to insert resync layer");
		return 0;
	}

	return 1;
}

static int _failed_mirrors_count(struct logical_volume *lv)
{
	struct lv_segment *lvseg;
	int ret = 0;
	unsigned s;

	dm_list_iterate_items(lvseg, &lv->segments) {
		if (!seg_is_mirrored(lvseg))
			return -1;
		for (s = 0; s < lvseg->area_count; s++) {
			if (seg_type(lvseg, s) == AREA_LV) {
				if (is_temporary_mirror_layer(seg_lv(lvseg, s)))
					ret += _failed_mirrors_count(seg_lv(lvseg, s));
				else if (lv_is_partial(seg_lv(lvseg, s)))
					++ ret;
			}
			else if (seg_type(lvseg, s) == AREA_PV &&
				 is_missing_pv(seg_pv(lvseg, s)))
				++ret;
		}
	}

	return ret;
}

static int _failed_logs_count(struct logical_volume *lv)
{
	int ret = 0;
	unsigned s;
	struct logical_volume *log_lv = first_seg(lv)->log_lv;
	if (log_lv && lv_is_partial(log_lv)) {
		if (lv_is_mirrored(log_lv))
			ret += _failed_mirrors_count(log_lv);
		else
			ret += 1;
	}
	for (s = 0; s < first_seg(lv)->area_count; s++) {
		if (seg_type(first_seg(lv), s) == AREA_LV &&
		    is_temporary_mirror_layer(seg_lv(first_seg(lv), s)))
			ret += _failed_logs_count(seg_lv(first_seg(lv), s));
	}
	return ret;
}


static struct dm_list *_failed_pv_list(struct volume_group *vg)
{
	struct dm_list *failed_pvs;
	struct pv_list *pvl, *new_pvl;

	if (!(failed_pvs = dm_pool_alloc(vg->vgmem, sizeof(*failed_pvs)))) {
		log_error("Allocation of list of failed_pvs failed.");
		return NULL;
	}

	dm_list_init(failed_pvs);

	dm_list_iterate_items(pvl, &vg->pvs) {
		if (!is_missing_pv(pvl->pv))
			continue;

		/*
		 * Finally, --repair will remove empty PVs.
		 * But we only want remove these which are output of repair,
		 * Do not count these which are already empty here.
		 * FIXME: code should traverse PV in LV not in whole VG.
		 * FIXME: layer violation? should it depend on vgreduce --removemising?
		 */
		if (pvl->pv->pe_alloc_count == 0)
			continue;

		if (!(new_pvl = dm_pool_alloc(vg->vgmem, sizeof(*new_pvl)))) {
			log_error("Allocation of failed_pvs list entry failed.");
			return NULL;
		}
		new_pvl->pv = pvl->pv;
		dm_list_add(failed_pvs, &new_pvl->list);
	}

	return failed_pvs;
}

static int _is_partial_lv(struct logical_volume *lv,
			  void *baton __attribute__((unused)))
{
	return lv_is_partial(lv);
}

/*
 * Walk down the stacked mirror LV to the original mirror LV.
 */
static struct logical_volume *_original_lv(struct logical_volume *lv)
{
	struct logical_volume *next_lv = lv, *tmp_lv;

	while ((tmp_lv = find_temporary_mirror(next_lv)))
		next_lv = tmp_lv;

	return next_lv;
}

static void _lvconvert_mirrors_repair_ask(struct cmd_context *cmd,
					  int failed_log, int failed_mirrors,
					  int *replace_log, int *replace_mirrors)
{
	const char *leg_policy, *log_policy;
	int force = arg_count(cmd, force_ARG);
	int yes = arg_count(cmd, yes_ARG);

	if (arg_count(cmd, usepolicies_ARG)) {
		leg_policy = find_config_tree_str(cmd, activation_mirror_image_fault_policy_CFG, NULL);
		log_policy = find_config_tree_str(cmd, activation_mirror_log_fault_policy_CFG, NULL);
		*replace_mirrors = strcmp(leg_policy, "remove");
		*replace_log = strcmp(log_policy, "remove");
		return;
	}

	if (force != PROMPT) {
		*replace_log = *replace_mirrors = 0;
		return;
	}

	*replace_log = *replace_mirrors = 1;

	if (yes)
		return;

	if (failed_log &&
	    yes_no_prompt("Attempt to replace failed mirror log? [y/n]: ") == 'n')
		*replace_log = 0;

	if (failed_mirrors &&
	    yes_no_prompt("Attempt to replace failed mirror images "
			  "(requires full device resync)? [y/n]: ") == 'n')
		*replace_mirrors = 0;
}

/*
 * _get_log_count
 * @lv: the mirror LV
 *
 * Get the number of on-disk copies of the log.
 *  0  = 'core'
 *  1  = 'disk'
 *  2+ = 'mirrored'
 */
static uint32_t _get_log_count(struct logical_volume *lv)
{
	struct logical_volume *log_lv;

	log_lv = first_seg(_original_lv(lv))->log_lv;
	if (log_lv)
		return lv_mirror_count(log_lv);

	return 0;
}

static int _lv_update_mirrored_log(struct logical_volume *lv,
				   struct dm_list *operable_pvs,
				   int log_count)
{
	int old_log_count;
	struct logical_volume *log_lv;

	/*
	 * When log_count is 0, mirrored log doesn't need to be
	 * updated here but it will be removed later.
	 */
	if (!log_count)
		return 1;

	log_lv = first_seg(_original_lv(lv))->log_lv;
	if (!log_lv || !lv_is_mirrored(log_lv))
		return 1;

	old_log_count = _get_log_count(lv);
	if (old_log_count == log_count)
		return 1;

	/* Reducing redundancy of the log */
	return remove_mirror_images(log_lv, log_count,
				    is_mirror_image_removable,
				    operable_pvs, 0U);
}

static int _lv_update_log_type(struct cmd_context *cmd,
			       struct lvconvert_params *lp,
			       struct logical_volume *lv,
			       struct dm_list *operable_pvs,
			       int log_count)
{
	int old_log_count;
	uint32_t region_size = (lp) ? lp->region_size :
		first_seg(lv)->region_size;
	alloc_policy_t alloc = (lp) ? lp->alloc : lv->alloc;
	struct logical_volume *original_lv;
	struct logical_volume *log_lv;

	old_log_count = _get_log_count(lv);
	if (old_log_count == log_count)
		return 1;

	original_lv = _original_lv(lv);
	/* Remove an existing log completely */
	if (!log_count) {
		if (!remove_mirror_log(cmd, original_lv, operable_pvs,
				       arg_count(cmd, yes_ARG) ||
				       arg_count(cmd, force_ARG)))
			return_0;
		return 1;
	}

	log_lv = first_seg(original_lv)->log_lv;

	/* Adding redundancy to the log */
	if (old_log_count < log_count) {
		region_size = adjusted_mirror_region_size(lv->vg->extent_size,
							  lv->le_count,
							  region_size, 0,
							  vg_is_clustered(lv->vg));

		if (!add_mirror_log(cmd, original_lv, log_count,
				    region_size, operable_pvs, alloc))
			return_0;
		/*
		 * FIXME: This simple approach won't work in cluster mirrors,
		 *        but it doesn't matter because we don't support
		 *        mirrored logs in cluster mirrors.
		 */
		if (old_log_count &&
		    !lv_update_and_reload(log_lv))
			return_0;

		return 1;
	}

	/* Reducing redundancy of the log */
	return remove_mirror_images(log_lv, log_count,
				    is_mirror_image_removable, operable_pvs, 1U);
}

/*
 * Reomove missing and empty PVs from VG, if are also in provided list
 */
static void _remove_missing_empty_pv(struct volume_group *vg, struct dm_list *remove_pvs)
{
	struct pv_list *pvl, *pvl_vg, *pvlt;
	int removed = 0;

	if (!remove_pvs)
		return;

	dm_list_iterate_items(pvl, remove_pvs) {
		dm_list_iterate_items_safe(pvl_vg, pvlt, &vg->pvs) {
			if (!id_equal(&pvl->pv->id, &pvl_vg->pv->id) ||
			    !is_missing_pv(pvl_vg->pv) ||
			    pvl_vg->pv->pe_alloc_count != 0)
				continue;

			/* FIXME: duplication of vgreduce code, move this to library */
			vg->free_count -= pvl_vg->pv->pe_count;
			vg->extent_count -= pvl_vg->pv->pe_count;
			del_pvl_from_vgs(vg, pvl_vg);
			free_pv_fid(pvl_vg->pv);

			removed++;
		}
	}

	if (removed) {
		if (!vg_write(vg) || !vg_commit(vg)) {
			stack;
			return;
		}
		log_warn("%d missing and now unallocated Physical Volumes removed from VG.", removed);
	}
}

/*
 * _lvconvert_mirrors_parse_params
 *
 * This function performs the following:
 *  1) Gets the old values of mimage and log counts
 *  2) Parses the CLI args to find the new desired values
 *  3) Adjusts 'lp->mirrors' to the appropriate absolute value.
 *     (Remember, 'lp->mirrors' is specified in terms of the number of "copies"
 *      vs. the number of mimages.  It can also be a relative value.)
 *  4) Sets 'lp->need_polling' if collapsing
 *  5) Validates other mirror params
 *
 * Returns: 1 on success, 0 on error
 */
static int _lvconvert_mirrors_parse_params(struct cmd_context *cmd,
					   struct logical_volume *lv,
					   struct lvconvert_params *lp,
					   uint32_t *old_mimage_count,
					   uint32_t *old_log_count,
					   uint32_t *new_mimage_count,
					   uint32_t *new_log_count)
{
	*old_mimage_count = lv_mirror_count(lv);
	*old_log_count = _get_log_count(lv);

	if (is_lockd_type(lv->vg->lock_type) && arg_count(cmd, splitmirrors_ARG)) {
		/* FIXME: we need to create a lock for the new LV. */
		log_error("Unable to split mirrors in VG with lock_type %s", lv->vg->lock_type);
		return 0;
	}

	/*
	 * Collapsing a stack of mirrors:
	 *
	 * If called with no argument, try collapsing the resync layers
	 */
	if (!arg_count(cmd, mirrors_ARG) && !arg_count(cmd, mirrorlog_ARG) &&
	    !arg_count(cmd, corelog_ARG) && !arg_count(cmd, regionsize_ARG) &&
	    !arg_count(cmd, splitmirrors_ARG) && !lp->repair) {
		*new_mimage_count = *old_mimage_count;
		*new_log_count = *old_log_count;

		if (find_temporary_mirror(lv) || lv_is_converting(lv))
			lp->need_polling = 1;
		return 1;
	}

	/*
	 * Adjusting mimage count?
	 */
	if (!arg_count(cmd, mirrors_ARG) && !arg_count(cmd, splitmirrors_ARG))
		lp->mirrors = *old_mimage_count;
	else if (lp->mirrors_sign == SIGN_PLUS)
		lp->mirrors = *old_mimage_count + lp->mirrors;
	else if (lp->mirrors_sign == SIGN_MINUS)
		lp->mirrors = (*old_mimage_count > lp->mirrors) ?
			*old_mimage_count - lp->mirrors: 0;
	else
		lp->mirrors += 1;

	*new_mimage_count = lp->mirrors;

	/* Too many mimages? */
	if (lp->mirrors > DEFAULT_MIRROR_MAX_IMAGES) {
		log_error("Only up to %d images in mirror supported currently.",
			  DEFAULT_MIRROR_MAX_IMAGES);
		return 0;
	}

	/* Did the user try to subtract more legs than available? */
	if (lp->mirrors < 1) {
		log_error("Unable to reduce images by specified amount - only %d in %s",
			  *old_mimage_count, lv->name);
		return 0;
	}

	/*
	 * FIXME: It would be nice to say what we are adjusting to, but
	 * I really don't know whether to specify the # of copies or mimages.
	 */
	if (*old_mimage_count != *new_mimage_count)
		log_verbose("Adjusting mirror image count of %s", lv->name);

	/*
	 * Adjust log type
	 *
	 * If we are converting from a mirror to another mirror or simply
	 * changing the log type, we start by assuming they want the log
	 * type the same and then parse the given args.  OTOH, If we are
	 * converting from linear to mirror, then we start from the default
	 * position that the user would like a 'disk' log.
	 */
	*new_log_count = (*old_mimage_count > 1) ? *old_log_count : 1;
	if (!arg_count(cmd, corelog_ARG) && !arg_count(cmd, mirrorlog_ARG))
		return 1;

	*new_log_count = arg_int_value(cmd, mirrorlog_ARG,
				       arg_is_set(cmd, corelog_ARG) ? MIRROR_LOG_CORE : DEFAULT_MIRRORLOG);

	/*
	 * No mirrored logs for cluster mirrors until
	 * log daemon is multi-threaded.
	 */
	if ((*new_log_count == MIRROR_LOG_MIRRORED) && vg_is_clustered(lv->vg)) {
		log_error("Log type, \"mirrored\", is unavailable to cluster mirrors");
		return 0;
	}

	log_verbose("Setting logging type to %s", get_mirror_log_name(*new_log_count));

	/*
	 * Region size must not change on existing mirrors
	 */
	if (arg_count(cmd, regionsize_ARG) && lv_is_mirrored(lv) &&
	    (lp->region_size != first_seg(lv)->region_size)) {
		log_error("Mirror log region size cannot be changed on "
			  "an existing mirror.");
		return 0;
	}

	/*
	 * For the most part, we cannot handle multi-segment mirrors. Bail out
	 * early if we have encountered one.
	 */
	if (lv_is_mirrored(lv) && dm_list_size(&lv->segments) != 1) {
		log_error("Logical volume %s has multiple "
			  "mirror segments.", lv->name);
		return 0;
	}

	return 1;
}


/*
 * _lvconvert_mirrors_aux
 *
 * Add/remove mirror images and adjust log type.  'operable_pvs'
 * are the set of PVs open to removal or allocation - depending
 * on the operation being performed.
 */
static int _lvconvert_mirrors_aux(struct cmd_context *cmd,
				  struct logical_volume *lv,
				  struct lvconvert_params *lp,
				  struct dm_list *operable_pvs,
				  uint32_t new_mimage_count,
				  uint32_t new_log_count)
{
	uint32_t region_size;
	struct lv_segment *seg;
	struct logical_volume *layer_lv;
	uint32_t old_mimage_count = lv_mirror_count(lv);
	uint32_t old_log_count = _get_log_count(lv);

	if ((lp->mirrors == 1) && !lv_is_mirrored(lv)) {
		log_warn("Logical volume %s is already not mirrored.",
			 lv->name);
		return 1;
	}

	region_size = adjusted_mirror_region_size(lv->vg->extent_size,
						  lv->le_count,
						  lp->region_size, 0,
						  vg_is_clustered(lv->vg));

	if (!operable_pvs)
		operable_pvs = lp->pvh;

	seg = first_seg(lv);

	/*
	 * Up-convert from linear to mirror
	 */
	if (!lv_is_mirrored(lv)) {
		/* FIXME Share code with lvcreate */

		/*
		 * FIXME should we give not only lp->pvh, but also all PVs
		 * currently taken by the mirror? Would make more sense from
		 * user perspective.
		 */
		if (!lv_add_mirrors(cmd, lv, new_mimage_count - 1, lp->stripes,
				    lp->stripe_size, region_size, new_log_count, operable_pvs,
				    lp->alloc, MIRROR_BY_LV))
			return_0;

		if (lp->wait_completion)
			lp->need_polling = 1;

		goto out;
	}

	/*
	 * Up-convert m-way mirror to n-way mirror
	 */
	if (new_mimage_count > old_mimage_count) {
		if (lv->status & LV_NOTSYNCED) {
			log_error("Can't add mirror to out-of-sync mirrored "
				  "LV: use lvchange --resync first.");
			return 0;
		}

		/*
		 * We allow snapshots of mirrors, but for now, we
		 * do not allow up converting mirrors that are under
		 * snapshots.  The layering logic is somewhat complex,
		 * and preliminary test show that the conversion can't
		 * seem to get the correct %'age of completion.
		 */
		if (lv_is_origin(lv)) {
			log_error("Can't add additional mirror images to "
				  "mirrors that are under snapshots");
			return 0;
		}

		/*
		 * Is there already a convert in progress?  We do not
		 * currently allow more than one.
		 */
		if (find_temporary_mirror(lv) || lv_is_converting(lv)) {
			log_error("%s is already being converted.  Unable to start another conversion.",
				  lv->name);
			return 0;
		}

		/*
		 * Log addition/removal should be done before the layer
		 * insertion to make the end result consistent with
		 * linear-to-mirror conversion.
		 */
		if (!_lv_update_log_type(cmd, lp, lv,
					 operable_pvs, new_log_count))
			return_0;

		/* Insert a temporary layer for syncing,
		 * only if the original lv is using disk log. */
		if (seg->log_lv && !_insert_lvconvert_layer(cmd, lv)) {
			log_error("Failed to insert resync layer");
			return 0;
		}

		/* FIXME: can't have multiple mlogs. force corelog. */
		if (!lv_add_mirrors(cmd, lv,
				    new_mimage_count - old_mimage_count,
				    lp->stripes, lp->stripe_size,
				    region_size, 0U, operable_pvs, lp->alloc,
				    MIRROR_BY_LV)) {
			layer_lv = seg_lv(first_seg(lv), 0);
			if (!remove_layer_from_lv(lv, layer_lv) ||
			    (lv_is_active(layer_lv) &&
			     !deactivate_lv(cmd, layer_lv)) ||
			    !lv_remove(layer_lv) || !vg_write(lv->vg) ||
			    !vg_commit(lv->vg)) {
				log_error("ABORTING: Failed to remove "
					  "temporary mirror layer %s.",
					  layer_lv->name);
				log_error("Manual cleanup with vgcfgrestore "
					  "and dmsetup may be required.");
				return 0;
			}

			return_0;
		}
		if (seg->log_lv)
			lv->status |= CONVERTING;
		lp->need_polling = 1;

		goto out_skip_log_convert;
	}

	/*
	 * Down-convert (reduce # of mimages).
	 */
	if (new_mimage_count < old_mimage_count) {
		uint32_t nmc = old_mimage_count - new_mimage_count;
		uint32_t nlc = (!new_log_count || lp->mirrors == 1) ? 1U : 0U;

		/* FIXME: Why did nlc used to be calculated that way? */

		/* Reduce number of mirrors */
		if (lp->keep_mimages) {
			if (arg_count(cmd, trackchanges_ARG)) {
				log_error("--trackchanges is not available "
					  "to 'mirror' segment type");
				return 0;
			}
			if (!lv_split_mirror_images(lv, lp->lv_split_name,
						    nmc, operable_pvs))
				return_0;
		} else if (!lv_remove_mirrors(cmd, lv, nmc, nlc,
					      is_mirror_image_removable, operable_pvs, 0))
			return_0;

		goto out; /* Just in case someone puts code between */
	}

out:
	/*
	 * Converting the log type
	 */
	if (lv_is_mirrored(lv) && (old_log_count != new_log_count)) {
		if (!_lv_update_log_type(cmd, lp, lv,
					 operable_pvs, new_log_count))
			return_0;
	}

out_skip_log_convert:

	if (!lv_update_and_reload(lv))
		return_0;

	return 1;
}

int mirror_remove_missing(struct cmd_context *cmd,
			  struct logical_volume *lv, int force)
{
	struct dm_list *failed_pvs;
	int log_count = _get_log_count(lv) - _failed_logs_count(lv);

	if (!(failed_pvs = _failed_pv_list(lv->vg)))
		return_0;

	if (force && _failed_mirrors_count(lv) == (int)lv_mirror_count(lv)) {
		log_error("No usable images left in %s.", display_lvname(lv));
		return lv_remove_with_dependencies(cmd, lv, DONT_PROMPT, 0);
        }

	/*
	 * We must adjust the log first, or the entire mirror
	 * will get stuck during a suspend.
	 */
	if (!_lv_update_mirrored_log(lv, failed_pvs, log_count))
		return_0;

	if (_failed_mirrors_count(lv) > 0 &&
	    !lv_remove_mirrors(cmd, lv, _failed_mirrors_count(lv),
			       log_count ? 0U : 1U,
			       _is_partial_lv, NULL, 0))
		return_0;

	if (lv_is_mirrored(lv) &&
	    !_lv_update_log_type(cmd, NULL, lv, failed_pvs, log_count))
		return_0;

	if (!lv_update_and_reload(lv))
		return_0;

	return 1;
}

/*
 * _lvconvert_mirrors_repair
 *
 * This function operates in two phases.  First, all of the bad
 * devices are removed from the mirror.  Then, if desired by the
 * user, the devices are replaced.
 *
 * 'old_mimage_count' and 'old_log_count' are there so we know
 * what to convert to after the removal of devices.
 */
static int _lvconvert_mirrors_repair(struct cmd_context *cmd,
				     struct logical_volume *lv,
				     struct lvconvert_params *lp)
{
	int failed_logs;
	int failed_mimages;
	int replace_logs = 0;
	int replace_mimages = 0;
	uint32_t log_count;

	uint32_t original_mimages = lv_mirror_count(lv);
	uint32_t original_logs = _get_log_count(lv);

	cmd->handles_missing_pvs = 1;
	cmd->partial_activation = 1;
	lp->need_polling = 0;

	lv_check_transient(lv); /* TODO check this in lib for all commands? */

	if (!lv_is_partial(lv)) {
		log_print_unless_silent("Volume %s is consistent. Nothing to repair.",
					display_lvname(lv));
		return 1;
	}

	failed_mimages = _failed_mirrors_count(lv);
	failed_logs = _failed_logs_count(lv);

	if (!mirror_remove_missing(cmd, lv, 0))
		return_0;

	if (failed_mimages)
		log_print_unless_silent("Mirror status: %d of %d images failed.",
					failed_mimages, original_mimages);

	/*
	 * Count the failed log devices
	 */
	if (failed_logs)
		log_print_unless_silent("Mirror log status: %d of %d images failed.",
					failed_logs, original_logs);

	/*
	 * Find out our policies
	 */
	_lvconvert_mirrors_repair_ask(cmd, failed_logs, failed_mimages,
				      &replace_logs, &replace_mimages);

	/*
	 * Second phase - replace faulty devices
	 */
	lp->mirrors = replace_mimages ? original_mimages : (original_mimages - failed_mimages);

	/*
	 * It does not make sense to replace the log if the volume is no longer
	 * a mirror.
	 */
	if (lp->mirrors == 1)
		replace_logs = 0;

	log_count = replace_logs ? original_logs : (original_logs - failed_logs);

	while (replace_mimages || replace_logs) {
		log_warn("Trying to up-convert to %d images, %d logs.", lp->mirrors, log_count);
		if (_lvconvert_mirrors_aux(cmd, lv, lp, NULL,
					   lp->mirrors, log_count))
			break;
		if (lp->mirrors > 2)
			--lp->mirrors;
		else if (log_count > 0)
			--log_count;
		else
			break; /* nowhere to go, anymore... */
	}

	if (replace_mimages && lv_mirror_count(lv) != original_mimages)
		log_warn("WARNING: Failed to replace %d of %d images in volume %s.",
			 original_mimages - lv_mirror_count(lv), original_mimages,
			 display_lvname(lv));
	if (replace_logs && _get_log_count(lv) != original_logs)
		log_warn("WARNING: Failed to replace %d of %d logs in volume %s.",
			 original_logs - _get_log_count(lv), original_logs,
			 display_lvname(lv));

	/* if (!arg_count(cmd, use_policies_ARG) && (lp->mirrors != old_mimage_count
						  || log_count != old_log_count))
						  return 0; */

	return 1;
}

static int _lvconvert_validate_thin(struct logical_volume *lv,
				    struct lvconvert_params *lp)
{
	if (!lv_is_thin_pool(lv) && !lv_is_thin_volume(lv))
		return 1;

	log_error("Converting thin%s segment type for %s to %s is not supported.",
		  lv_is_thin_pool(lv) ? " pool" : "",
		  display_lvname(lv), lp->segtype->name);

	if (lv_is_thin_volume(lv))
		return 0;

	/* Give advice for thin pool conversion */
	log_error("For pool data volume conversion use %s.",
		  display_lvname(seg_lv(first_seg(lv), 0)));
	log_error("For pool metadata volume conversion use %s.",
		  display_lvname(first_seg(lv)->metadata_lv));
	return 0;
}

/*
 * _lvconvert_mirrors
 *
 * Determine what is being done.  Are we doing a conversion, repair, or
 * collapsing a stack?  Once determined, call helper functions.
 */
static int _lvconvert_mirrors(struct cmd_context *cmd,
			      struct logical_volume *lv,
			      struct lvconvert_params *lp)
{
	uint32_t old_mimage_count;
	uint32_t old_log_count;
	uint32_t new_mimage_count;
	uint32_t new_log_count;

	if (lp->merge_mirror) {
		log_error("Unable to merge mirror images"
			  "of segment type 'mirror'");
		return 0;
	}

	if (!_lvconvert_validate_thin(lv, lp))
		return_0;

	if (lv_is_thin_type(lv)) {
		log_error("Mirror segment type cannot be used for thinpool%s.\n"
			  "Try \"%s\" segment type instead.",
			  lv_is_thin_pool_data(lv) ? "s" : " metadata",
			  SEG_TYPE_NAME_RAID1);
		return 0;
	}

	if (lv_is_cache_type(lv)) {
		log_error("Mirrors are not yet supported on cache LVs %s.",
			  display_lvname(lv));
		return 0;
	}

	/* Adjust mimage and/or log count */
	if (!_lvconvert_mirrors_parse_params(cmd, lv, lp,
					     &old_mimage_count, &old_log_count,
					     &new_mimage_count, &new_log_count))
		return 0;

        if (((old_mimage_count < new_mimage_count && old_log_count > new_log_count) ||
             (old_mimage_count > new_mimage_count && old_log_count < new_log_count)) &&
            lp->pv_count) {
		log_error("Cannot both allocate and free extents when "
			  "specifying physical volumes to use.");
		log_error("Please specify the operation in two steps.");
		return 0;
        }

	/* Nothing to do?  (Probably finishing collapse.) */
	if ((old_mimage_count == new_mimage_count) &&
	    (old_log_count == new_log_count) && !lp->repair)
		return 1;

	if (lp->repair)
		return _lvconvert_mirrors_repair(cmd, lv, lp);

	if (!_lvconvert_mirrors_aux(cmd, lv, lp, NULL,
				    new_mimage_count, new_log_count))
		return 0;

	if (!lp->need_polling)
		log_print_unless_silent("Logical volume %s converted.", lv->name);

	backup(lv->vg);
	return 1;
}

static int _is_valid_raid_conversion(const struct segment_type *from_segtype,
				    const struct segment_type *to_segtype)
{
	if (from_segtype == to_segtype)
		return 1;

	if (!segtype_is_raid(from_segtype) && !segtype_is_raid(to_segtype))
		return_0;  /* Not converting to or from RAID? */

	return 1;
}

static void _lvconvert_raid_repair_ask(struct cmd_context *cmd,
				       struct lvconvert_params *lp,
				       int *replace_dev)
{
	const char *dev_policy;

	*replace_dev = 1;

	if (arg_count(cmd, usepolicies_ARG)) {
		dev_policy = find_config_tree_str(cmd, activation_raid_fault_policy_CFG, NULL);

		if (!strcmp(dev_policy, "allocate") ||
		    !strcmp(dev_policy, "replace"))
			return;

		/* else if (!strcmp(dev_policy, "anything_else")) -- no replace */
		*replace_dev = 0;
		return;
	}

	if (!lp->yes &&
	    yes_no_prompt("Attempt to replace failed RAID images "
			  "(requires full device resync)? [y/n]: ") == 'n') {
		*replace_dev = 0;
	}
}

static int _lvconvert_raid(struct logical_volume *lv, struct lvconvert_params *lp)
{
	int replace = 0, image_count = 0;
	struct dm_list *failed_pvs;
	struct cmd_context *cmd = lv->vg->cmd;
	struct lv_segment *seg = first_seg(lv);
	dm_percent_t sync_percent;

	if (!arg_count(cmd, type_ARG))
		lp->segtype = seg->segtype;

	/* Can only change image count for raid1 and linear */
	if (arg_count(cmd, mirrors_ARG) &&
	    !seg_is_mirrored(seg) && !seg_is_linear(seg)) {
		log_error("'--mirrors/-m' is not compatible with %s",
			  lvseg_name(seg));
		return 0;
	}

	if (!_lvconvert_validate_thin(lv, lp))
		return_0;

	if (!_is_valid_raid_conversion(seg->segtype, lp->segtype)) {
		log_error("Unable to convert %s/%s from %s to %s",
			  lv->vg->name, lv->name,
			  lvseg_name(seg), lp->segtype->name);
		return 0;
	}

	if (seg_is_linear(seg) && !lp->merge_mirror && !arg_count(cmd, mirrors_ARG)) {
		log_error("Raid conversions require -m/--mirrors");
		return 0;
	}

	/* Change number of RAID1 images */
	if (arg_count(cmd, mirrors_ARG) || arg_count(cmd, splitmirrors_ARG)) {
		image_count = lv_raid_image_count(lv);
		if (lp->mirrors_sign == SIGN_PLUS)
			image_count += lp->mirrors;
		else if (lp->mirrors_sign == SIGN_MINUS)
			image_count -= lp->mirrors;
		else
			image_count = lp->mirrors + 1;

		if (image_count < 1) {
			log_error("Unable to %s images by specified amount",
				  arg_count(cmd, splitmirrors_ARG) ?
				  "split" : "reduce");
			return 0;
		}
	}

	if (lp->merge_mirror)
		return lv_raid_merge(lv);

	if (arg_count(cmd, trackchanges_ARG))
		return lv_raid_split_and_track(lv, lp->pvh);

	if (arg_count(cmd, splitmirrors_ARG))
		return lv_raid_split(lv, lp->lv_split_name,
				     image_count, lp->pvh);

	if (arg_count(cmd, mirrors_ARG))
		return lv_raid_change_image_count(lv, image_count, lp->pvh);

	if (arg_count(cmd, type_ARG))
		return lv_raid_reshape(lv, lp->segtype);

	if (arg_count(cmd, replace_ARG))
		return lv_raid_replace(lv, lp->replace_pvh, lp->pvh);

	if (lp->repair) {
		if (!lv_is_active_exclusive_locally(lv_lock_holder(lv))) {
			log_error("%s/%s must be active %sto perform this"
				  " operation.", lv->vg->name, lv->name,
				  vg_is_clustered(lv->vg) ?
				  "exclusive locally " : "");
			return 0;
		}

		if (!lv_raid_percent(lv, &sync_percent)) {
			log_error("Unable to determine sync status of %s/%s.",
				  lv->vg->name, lv->name);
			return 0;
		}

		if (sync_percent != DM_PERCENT_100) {
			log_warn("WARNING: %s/%s is not in-sync.",
				 lv->vg->name, lv->name);
			log_warn("WARNING: Portions of the array may be unrecoverable.");

			/*
			 * The kernel will not allow a device to be replaced
			 * in an array that is not in-sync unless we override
			 * by forcing the array to be considered "in-sync".
			 */
			init_mirror_in_sync(1);
		}

		_lvconvert_raid_repair_ask(cmd, lp, &replace);

		if (replace) {
			if (!(failed_pvs = _failed_pv_list(lv->vg)))
				return_0;

			if (!lv_raid_replace(lv, failed_pvs, lp->pvh)) {
				log_error("Failed to replace faulty devices in"
					  " %s/%s.", lv->vg->name, lv->name);
				return 0;
			}

			log_print_unless_silent("Faulty devices in %s/%s successfully"
						" replaced.", lv->vg->name, lv->name);
			return 1;
		}

		/* "warn" if policy not set to replace */
		if (arg_count(cmd, usepolicies_ARG))
			log_warn("Use 'lvconvert --repair %s/%s' to replace "
				 "failed device.", lv->vg->name, lv->name);
		return 1;
	}

	log_error("Conversion operation not yet supported.");
	return 0;
}

static int _lvconvert_splitsnapshot(struct cmd_context *cmd, struct logical_volume *cow,
				    struct lvconvert_params *lp)
{
	struct volume_group *vg = cow->vg;
	const char *cow_name = display_lvname(cow);

	if (!lv_is_cow(cow)) {
		log_error("%s is not a snapshot.", cow_name);
		return 0;
	}

	if (lv_is_origin(cow) || lv_is_external_origin(cow)) {
		log_error("Unable to split LV %s that is a snapshot origin.", cow_name);
		return 0;
	}

	if (lv_is_merging_cow(cow)) {
		log_error("Unable to split off snapshot %s being merged into its origin.", cow_name);
		return 0;
	}

	if (lv_is_virtual_origin(origin_from_cow(cow))) {
		log_error("Unable to split off snapshot %s with virtual origin.", cow_name);
		return 0;
	}

	if (lv_is_thin_pool(cow) || lv_is_pool_metadata_spare(cow)) {
		log_error("Unable to split off LV %s needed by thin volume(s).", cow_name);
		return 0;
	}

	if (!(vg->fid->fmt->features & FMT_MDAS)) {
		log_error("Unable to split off snapshot %s using old LVM1-style metadata.", cow_name);
		return 0;
	}

	if (is_lockd_type(vg->lock_type)) {
		/* FIXME: we need to create a lock for the new LV. */
		log_error("Unable to split snapshots in VG with lock_type %s", vg->lock_type);
		return 0;
	}

	if (!vg_check_status(vg, LVM_WRITE))
		return_0;

	if (lv_is_pvmove(cow) || lv_is_mirror_type(cow) || lv_is_raid_type(cow) || lv_is_thin_type(cow)) {
		log_error("LV %s type is unsupported with --splitsnapshot.", cow_name);
		return 0;
	}

	if (lv_is_active_locally(cow)) {
		if (!lv_check_not_in_use(cow, 1))
			return_0;

		if ((lp->force == PROMPT) && !lp->yes &&
		    lv_is_visible(cow) &&
		    lv_is_active(cow)) {
			if (yes_no_prompt("Do you really want to split off active "
					  "logical volume %s? [y/n]: ", cow_name) == 'n') {
				log_error("Logical volume %s not split.", cow_name);
				return 0;
			}
		}
	}

	if (!archive(vg))
		return_0;

	log_verbose("Splitting snapshot %s from its origin.", cow_name);

	if (!vg_remove_snapshot(cow))
		return_0;

	backup(vg);

	log_print_unless_silent("Logical Volume %s split from its origin.", cow_name);

	return 1;
}


static int _lvconvert_split_cached(struct cmd_context *cmd,
				   struct logical_volume *lv)
{
	struct logical_volume *cache_pool_lv = first_seg(lv)->pool_lv;

	log_debug("Detaching cache pool %s from cached LV %s.",
		  display_lvname(cache_pool_lv), display_lvname(lv));

	if (!archive(lv->vg))
		return_0;

	if (!lv_cache_remove(lv))
		return_0;

	if (!vg_write(lv->vg) || !vg_commit(lv->vg))
		return_0;

	backup(lv->vg);

	log_print_unless_silent("Logical volume %s is not cached and cache pool %s is unused.",
				display_lvname(lv), display_lvname(cache_pool_lv));

	return 1;
}

static int _lvconvert_splitcache(struct cmd_context *cmd,
				 struct logical_volume *lv,
				 struct lvconvert_params *lp)
{
	struct lv_segment *seg;

	if (lv_is_thin_pool(lv))
		lv = seg_lv(first_seg(lv), 0); /* cached _tdata ? */

	/* When passed used cache-pool of used cached LV -> split cached LV */
	if (lv_is_cache_pool(lv) &&
	    (dm_list_size(&lv->segs_using_this_lv) == 1) &&
	    (seg = get_only_segment_using_this_lv(lv)) &&
	    seg_is_cache(seg))
		lv = seg->lv;

	/* Supported LV types for split */
	if (!lv_is_cache(lv)) {
		log_error("Split of %s is not cache.", display_lvname(lv));
		return 0;
	}

	if (!_lvconvert_split_cached(cmd, lv))
		return_0;

	return 1;
}

static int _lvconvert_split(struct cmd_context *cmd,
			    struct logical_volume *lv,
			    struct lvconvert_params *lp)
{
	struct lv_segment *seg;

	if (lv_is_thin_pool(lv) &&
	    lv_is_cache(seg_lv(first_seg(lv), 0)))
		lv = seg_lv(first_seg(lv), 0); /* cached _tdata ? */

	/* When passed used cache-pool of used cached LV -> split cached LV */
	if (lv_is_cache_pool(lv) &&
	    (dm_list_size(&lv->segs_using_this_lv) == 1) &&
	    (seg = get_only_segment_using_this_lv(lv)) &&
	    seg_is_cache(seg))
		lv = seg->lv;

	/* Supported LV types for split */
	if (lv_is_cache(lv)) {
		if (!_lvconvert_split_cached(cmd, lv))
			return_0;
	/* Add more types here */
	} else {
		log_error("Split of %s is unsupported.", display_lvname(lv));
		return 0;
	}

	return 1;
}

static int _lvconvert_uncache(struct cmd_context *cmd,
			      struct logical_volume *lv,
			      struct lvconvert_params *lp)
{
	struct lv_segment *seg;
	struct logical_volume *remove_lv;

	if (lv_is_thin_pool(lv))
		lv = seg_lv(first_seg(lv), 0); /* cached _tdata ? */

	if (!lv_is_cache(lv)) {
		log_error("Cannot uncache non-cached logical volume %s.",
			  display_lvname(lv));
		return 0;
	}

	seg = first_seg(lv);

	if (lv_is_partial(seg_lv(seg, 0))) {
		log_warn("WARNING: Cache origin logical volume %s is missing.",
			 display_lvname(seg_lv(seg, 0)));
		remove_lv = lv; /* When origin is missing, drop everything */
	} else
		remove_lv = seg->pool_lv;

	if (lv_is_partial(seg_lv(first_seg(seg->pool_lv), 0)))
		log_warn("WARNING: Cache pool data logical volume %s is missing.",
			 display_lvname(seg_lv(first_seg(seg->pool_lv), 0)));

	if (lv_is_partial(first_seg(seg->pool_lv)->metadata_lv))
		log_warn("WARNING: Cache pool metadata logical volume %s is missing.",
			 display_lvname(first_seg(seg->pool_lv)->metadata_lv));

	/* TODO: Check for failed cache as well to get prompting? */
	if (lv_is_partial(lv)) {
		if (strcmp("writethrough", get_cache_mode_name(first_seg(seg->pool_lv)))) {
			if (!lp->force) {
				log_error("Conversion aborted.");
				log_error("Cannot uncache writethrough cache volume %s without --force.",
					  display_lvname(lv));
				return 0;
			}
			log_warn("WARNING: Uncaching of partially missing writethrough cache volume %s might destroy your data.",
				 display_lvname(first_seg(seg->pool_lv)->metadata_lv));
		}

		if (!lp->yes &&
		    yes_no_prompt("Do you really want to uncache %s? with missing LVs [y/n]: ",
				  display_lvname(lv)) == 'n') {
			log_error("Conversion aborted.");
			return 0;
		}
	}

	if (lvremove_single(cmd, remove_lv, NULL) != ECMD_PROCESSED)
		return_0;

	if (remove_lv != lv)
		log_print_unless_silent("Logical volume %s is not cached.", display_lvname(lv));

	return 1;
}

static int _lvconvert_snapshot(struct cmd_context *cmd,
			       struct logical_volume *lv,
			       struct lvconvert_params *lp)
{
	struct logical_volume *org;
	const char *snap_name = display_lvname(lv);

	if (lv_is_cache_type(lv)) {
		log_error("Snapshots are not yet supported with cache type LVs %s.",
			  snap_name);
		return 0;
	}

	if (lv_is_mirrored(lv)) {
		log_error("Unable to convert mirrored LV %s into a snapshot.", snap_name);
		return 0;
	}

	if (lv_is_origin(lv)) {
		/* Unsupported stack */
		log_error("Unable to convert origin %s into a snapshot.", snap_name);
		return 0;
	}

	if (lv_is_pool(lv)) {
		log_error("Unable to convert pool LVs %s into a snapshot.", snap_name);
		return 0;
	}

	if (!(org = find_lv(lv->vg, lp->origin_name))) {
		log_error("Couldn't find origin volume %s in Volume group %s.",
			  lp->origin_name, lv->vg->name);
		return 0;
	}

	if (org == lv) {
		log_error("Unable to use %s as both snapshot and origin.", snap_name);
		return 0;
	}

	if (!cow_has_min_chunks(lv->vg, lv->le_count, lp->chunk_size))
		return_0;

	if (lv_is_locked(org) ||
	    lv_is_cache_type(org) ||
	    lv_is_thin_type(org) ||
	    lv_is_pvmove(org) ||
	    lv_is_mirrored(org) ||
	    lv_is_cow(org)) {
		log_error("Unable to convert an LV into a snapshot of a %s LV.",
			  lv_is_locked(org) ? "locked" :
			  lv_is_cache_type(org) ? "cache type" :
			  lv_is_thin_type(org) ? "thin type" :
			  lv_is_pvmove(org) ? "pvmove" :
			  lv_is_mirrored(org) ? "mirrored" :
			  "snapshot");
		return 0;
	}

	log_warn("WARNING: Converting logical volume %s to snapshot exception store.",
		 snap_name);
	log_warn("THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)");

	if (!lp->yes &&
	    yes_no_prompt("Do you really want to convert %s? [y/n]: ",
			  snap_name) == 'n') {
		log_error("Conversion aborted.");
		return 0;
	}

	if (!deactivate_lv(cmd, lv)) {
		log_error("Couldn't deactivate logical volume %s.", snap_name);
		return 0;
	}

	if (!lp->zero || !(lv->status & LVM_WRITE))
		log_warn("WARNING: %s not zeroed", snap_name);
	else {
		lv->status |= LV_TEMPORARY;
		if (!activate_lv_local(cmd, lv) ||
		    !wipe_lv(lv, (struct wipe_params) { .do_zero = 1 })) {
			log_error("Aborting. Failed to wipe snapshot exception store.");
			return 0;
		}
		lv->status &= ~LV_TEMPORARY;
		/* Deactivates cleared metadata LV */
		if (!deactivate_lv_local(lv->vg->cmd, lv)) {
			log_error("Failed to deactivate zeroed snapshot exception store.");
			return 0;
		}
	}

	if (!archive(lv->vg))
		return_0;

	if (!vg_add_snapshot(org, lv, NULL, org->le_count, lp->chunk_size)) {
		log_error("Couldn't create snapshot.");
		return 0;
	}

	/* store vg on disk(s) */
	if (!lv_update_and_reload(org))
		return_0;

	log_print_unless_silent("Logical volume %s converted to snapshot.", snap_name);

	return 1;
}

static int _lvconvert_merge_old_snapshot(struct cmd_context *cmd,
					 struct logical_volume *lv,
					 struct lvconvert_params *lp)
{
	int merge_on_activate = 0;
	struct logical_volume *origin = origin_from_cow(lv);
	struct lv_segment *snap_seg = find_snapshot(lv);
	struct lvinfo info;
	dm_percent_t snap_percent;

	/* Check if merge is possible */
	if (!lv_is_cow(lv)) {
		log_error("\"%s\" is not a mergeable logical volume.",
			  lv->name);
		return 0;
	}

	if (lv_is_merging_cow(lv)) {
		log_error("Snapshot %s is already merging.", lv->name);
		return 0;
	}

	if (lv_is_merging_origin(origin)) {
		log_error("Snapshot %s is already merging into the origin.",
			  find_snapshot(origin)->cow->name);
		return 0;
	}

	if (lv_is_virtual_origin(origin)) {
		log_error("Snapshot %s has virtual origin.", lv->name);
		return 0;
	}

	if (lv_is_external_origin(origin_from_cow(lv))) {
		log_error("Cannot merge snapshot \"%s\" into "
			  "the read-only external origin \"%s\".",
			  lv->name, origin_from_cow(lv)->name);
		return 0;
	}

	/* FIXME: test when snapshot is remotely active */
	if (lv_info(cmd, lv, 0, &info, 1, 0)
	    && info.exists && info.live_table &&
	    (!lv_snapshot_percent(lv, &snap_percent) ||
	     snap_percent == DM_PERCENT_INVALID)) {
		log_error("Unable to merge invalidated snapshot LV \"%s\".",
			  lv->name);
		return 0;
	}

	if (snap_seg->segtype->ops->target_present &&
	    !snap_seg->segtype->ops->target_present(cmd, snap_seg, NULL)) {
		log_error("Can't initialize snapshot merge. "
			  "Missing support in kernel?");
		return 0;
	}

	if (!archive(lv->vg))
		return_0;

	/*
	 * Prevent merge with open device(s) as it would likely lead
	 * to application/filesystem failure.  Merge on origin's next
	 * activation if either the origin or snapshot LV are currently
	 * open.
	 *
	 * FIXME testing open_count is racey; snapshot-merge target's
	 * constructor and DM should prevent appropriate devices from
	 * being open.
	 */
	if (lv_is_active_locally(origin)) {
		if (!lv_check_not_in_use(origin, 0)) {
			log_print_unless_silent("Can't merge until origin volume is closed.");
			merge_on_activate = 1;
		} else if (!lv_check_not_in_use(lv, 0)) {
			log_print_unless_silent("Can't merge until snapshot is closed.");
			merge_on_activate = 1;
		}
	} else if (vg_is_clustered(origin->vg) && lv_is_active(origin)) {
		/* When it's active somewhere else */
		log_print_unless_silent("Can't check whether remotely active snapshot is open.");
		merge_on_activate = 1;
	}

	init_snapshot_merge(snap_seg, origin);

	if (merge_on_activate) {
		/* Store and commit vg but skip starting the merge */
		if (!vg_write(lv->vg) || !vg_commit(lv->vg))
			return_0;
		backup(lv->vg);
	} else {
		/* Perform merge */
		if (!lv_update_and_reload(origin))
			return_0;

		lp->need_polling = 1;
		lp->lv_to_poll = origin;
	}

	if (merge_on_activate)
		log_print_unless_silent("Merging of snapshot %s will occur on "
					"next activation of %s.",
					display_lvname(lv), display_lvname(origin));
	else
		log_print_unless_silent("Merging of volume %s started.", lv->name);

	return 1;
}

static int _lvconvert_merge_thin_snapshot(struct cmd_context *cmd,
					  struct logical_volume *lv,
					  struct lvconvert_params *lp)
{
	int origin_is_active = 0, r = 0;
	struct lv_segment *snap_seg = first_seg(lv);
	struct logical_volume *origin = snap_seg->origin;

	if (!origin) {
		log_error("%s is not a mergeable logical volume.",
			  display_lvname(lv));
		return 0;
	}

	/* Check if merge is possible */
	if (lv_is_merging_origin(origin)) {
		log_error("Snapshot %s is already merging into the origin.",
			  display_lvname(find_snapshot(origin)->lv));
		return 0;
	}

	if (lv_is_external_origin(origin)) {
		if (!(origin = origin_from_cow(lv)))
			log_error(INTERNAL_ERROR "%s is missing origin.",
				  display_lvname(lv));
		else
			log_error("%s is read-only external origin %s.",
				  display_lvname(lv), display_lvname(origin));
		return 0;
	}

	if (lv_is_origin(origin)) {
		log_error("Merging into the old snapshot origin %s is not supported.",
			  display_lvname(origin));
		return 0;
	}

	if (!archive(lv->vg))
		return_0;

	// FIXME: allow origin to be specified
	// FIXME: verify snapshot is descendant of specified origin

	/*
	 * Prevent merge with open device(s) as it would likely lead
	 * to application/filesystem failure.  Merge on origin's next
	 * activation if either the origin or snapshot LV can't be
	 * deactivated.
	 */
	if (!deactivate_lv(cmd, lv))
		log_print_unless_silent("Delaying merge since snapshot is open.");
	else if ((origin_is_active = lv_is_active(origin)) &&
		 !deactivate_lv(cmd, origin))
		log_print_unless_silent("Delaying merge since origin volume is open.");
	else {
		/*
		 * Both thin snapshot and origin are inactive,
		 * replace the origin LV with its snapshot LV.
		 */
		if (!thin_merge_finish(cmd, origin, lv))
			goto_out;

		if (origin_is_active && !activate_lv(cmd, lv)) {
			log_error("Failed to reactivate origin %s.",
				  display_lvname(lv));
			goto out;
		}

		r = 1;
		goto out;
	}

	init_snapshot_merge(snap_seg, origin);

	/* Commit vg, merge will start with next activation */
	if (!vg_write(lv->vg) || !vg_commit(lv->vg))
		return_0;

	r = 1;
out:
	backup(lv->vg);

	if (r)
		log_print_unless_silent("Merging of thin snapshot %s will occur on "
					"next activation of %s.",
					display_lvname(lv), display_lvname(origin));
	return r;
}

static int _lvconvert_thin_pool_repair(struct cmd_context *cmd,
				       struct logical_volume *pool_lv,
				       struct lvconvert_params *lp)
{
	const char *dmdir = dm_dir();
	const char *thin_dump =
		find_config_tree_str_allow_empty(cmd, global_thin_dump_executable_CFG, NULL);
	const char *thin_repair =
		find_config_tree_str_allow_empty(cmd, global_thin_repair_executable_CFG, NULL);
	const struct dm_config_node *cn;
	const struct dm_config_value *cv;
	int ret = 0, status;
	int args = 0;
	const char *argv[19]; /* Max supported 10 args */
	char *dm_name, *trans_id_str;
	char meta_path[PATH_MAX];
	char pms_path[PATH_MAX];
	uint64_t trans_id;
	struct logical_volume *pmslv;
	struct logical_volume *mlv = first_seg(pool_lv)->metadata_lv;
	struct pipe_data pdata;
	FILE *f;

	if (!thin_repair || !thin_repair[0]) {
		log_error("Thin repair commnand is not configured. Repair is disabled.");
		return 0; /* Checking disabled */
	}

	pmslv = pool_lv->vg->pool_metadata_spare_lv;

	/* Check we have pool metadata spare LV */
	if (!handle_pool_metadata_spare(pool_lv->vg, 0, lp->pvh, 1))
		return_0;

	if (pmslv != pool_lv->vg->pool_metadata_spare_lv) {
		if (!vg_write(pool_lv->vg) || !vg_commit(pool_lv->vg))
			return_0;
		pmslv = pool_lv->vg->pool_metadata_spare_lv;
	}

	if (!(dm_name = dm_build_dm_name(cmd->mem, mlv->vg->name,
					 mlv->name, NULL)) ||
	    (dm_snprintf(meta_path, sizeof(meta_path), "%s/%s", dmdir, dm_name) < 0)) {
		log_error("Failed to build thin metadata path.");
		return 0;
	}

	if (!(dm_name = dm_build_dm_name(cmd->mem, pmslv->vg->name,
					 pmslv->name, NULL)) ||
	    (dm_snprintf(pms_path, sizeof(pms_path), "%s/%s", dmdir, dm_name) < 0)) {
		log_error("Failed to build pool metadata spare path.");
		return 0;
	}

	if (!(cn = find_config_tree_array(cmd, global_thin_repair_options_CFG, NULL))) {
		log_error(INTERNAL_ERROR "Unable to find configuration for global/thin_repair_options");
		return 0;
	}

	for (cv = cn->v; cv && args < 16; cv = cv->next) {
		if (cv->type != DM_CFG_STRING) {
			log_error("Invalid string in config file: "
				  "global/thin_repair_options");
			return 0;
		}
		argv[++args] = cv->v.str;
	}

	if (args == 10) {
		log_error("Too many options for thin repair command.");
		return 0;
	}

	argv[0] = thin_repair;
	argv[++args] = "-i";
	argv[++args] = meta_path;
	argv[++args] = "-o";
	argv[++args] = pms_path;
	argv[++args] = NULL;

	if (pool_is_active(pool_lv)) {
		log_error("Only inactive pool can be repaired.");
		return 0;
	}

	if (!activate_lv_local(cmd, pmslv)) {
		log_error("Cannot activate pool metadata spare volume %s.",
			  pmslv->name);
		return 0;
	}

	if (!activate_lv_local(cmd, mlv)) {
		log_error("Cannot activate thin pool metadata volume %s.",
			  mlv->name);
		goto deactivate_pmslv;
	}

	if (!(ret = exec_cmd(cmd, (const char * const *)argv, &status, 1))) {
		log_error("Repair of thin metadata volume of thin pool %s/%s failed (status:%d). "
			  "Manual repair required!",
			  pool_lv->vg->name, pool_lv->name, status);
		goto deactivate_mlv;
	}

	if (thin_dump[0]) {
		argv[0] = thin_dump;
		argv[1] = pms_path;
		argv[2] = NULL;

		if (!(f = pipe_open(cmd, argv, 0, &pdata)))
			log_warn("WARNING: Cannot read output from %s %s.", thin_dump, pms_path);
		else {
			/*
			 * Scan only the 1st. line for transation id.
			 * Watch out, if the thin_dump format changes
			 */
			if (fgets(meta_path, sizeof(meta_path), f) &&
			    (trans_id_str = strstr(meta_path, "transaction=\"")) &&
			    (sscanf(trans_id_str + 13, FMTu64, &trans_id) == 1) &&
			    (trans_id != first_seg(pool_lv)->transaction_id) &&
			    ((trans_id - 1) != first_seg(pool_lv)->transaction_id))
				log_error("Transaction id " FMTu64 " from pool \"%s/%s\" "
					  "does not match repaired transaction id "
					  FMTu64 " from %s.",
					  first_seg(pool_lv)->transaction_id,
					  pool_lv->vg->name, pool_lv->name, trans_id,
					  pms_path);

			(void) pipe_close(&pdata); /* killing pipe */
		}
	}

deactivate_mlv:
	if (!deactivate_lv(cmd, mlv)) {
		log_error("Cannot deactivate thin pool metadata volume %s.",
			  mlv->name);
		return 0;
	}

deactivate_pmslv:
	if (!deactivate_lv(cmd, pmslv)) {
		log_error("Cannot deactivate thin pool metadata volume %s.",
			  mlv->name);
		return 0;
	}

	if (!ret)
		return 0;

	if (pmslv == pool_lv->vg->pool_metadata_spare_lv) {
		pool_lv->vg->pool_metadata_spare_lv = NULL;
		pmslv->status &= ~POOL_METADATA_SPARE;
		lv_set_visible(pmslv);
	}

	/* Try to allocate new pool metadata spare LV */
	if (!handle_pool_metadata_spare(pool_lv->vg, 0, lp->pvh,
					lp->poolmetadataspare))
		stack;

	if (dm_snprintf(meta_path, sizeof(meta_path), "%s_meta%%d", pool_lv->name) < 0) {
		log_error("Can't prepare new metadata name for %s.", pool_lv->name);
		return 0;
	}

	if (!generate_lv_name(pool_lv->vg, meta_path, pms_path, sizeof(pms_path))) {
		log_error("Can't generate new name for %s.", meta_path);
		return 0;
	}

	if (!detach_pool_metadata_lv(first_seg(pool_lv), &mlv))
		return_0;

	/* Swap _pmspare and _tmeta name */
	if (!swap_lv_identifiers(cmd, mlv, pmslv))
		return_0;

	if (!attach_pool_metadata_lv(first_seg(pool_lv), pmslv))
		return_0;

	/* Used _tmeta (now _pmspare) becomes _meta%d */
	if (!lv_rename_update(cmd, mlv, pms_path, 0))
		return_0;

	if (!vg_write(pool_lv->vg) || !vg_commit(pool_lv->vg))
		return_0;

	log_warn("WARNING: If everything works, remove \"%s/%s\".",
		 mlv->vg->name, mlv->name);

	log_warn("WARNING: Use pvmove command to move \"%s/%s\" on the best fitting PV.",
		 pool_lv->vg->name, first_seg(pool_lv)->metadata_lv->name);

	return 1;
}

/* Currently converts only to thin volume with external origin */
static int _lvconvert_thin(struct cmd_context *cmd,
			   struct logical_volume *lv,
			   struct lvconvert_params *lp)
{
	struct logical_volume *torigin_lv, *pool_lv = lp->pool_data_lv;
	struct volume_group *vg = lv->vg;
	struct lvcreate_params lvc = {
		.activate = CHANGE_AEY,
		.alloc = ALLOC_INHERIT,
		.lv_name = lp->origin_name,
		.major = -1,
		.minor = -1,
		.permission = LVM_READ,
		.pool_name = pool_lv->name,
		.pvh = &vg->pvs,
		.read_ahead = DM_READ_AHEAD_AUTO,
		.stripes = 1,
		.virtual_extents = lv->le_count,
	};

	if (lv == pool_lv) {
		log_error("Can't use same LV %s for thin pool and thin volume.",
			  display_lvname(pool_lv));
		return 0;
	}

	if (lv_is_locked(lv) ||
	    !lv_is_visible(lv) ||
	    lv_is_cache_type(lv) ||
	    lv_is_cow(lv) ||
	    lv_is_pool(lv) ||
	    lv_is_pool_data(lv) ||
	    lv_is_pool_metadata(lv)) {
		log_error("Can't use%s%s %s %s as external origin.",
			  lv_is_locked(lv) ? " locked" : "",
			  lv_is_visible(lv) ? "" : " hidden",
			  lvseg_name(first_seg(lv)),
			  display_lvname(lv));
		return 0;
	}

	if (is_lockd_type(lv->vg->lock_type)) {
		/*
		 * FIXME: external origins don't work in lockd VGs.
		 * Prior to the lvconvert, there's a lock associated with
		 * the uuid of the external origin LV.  After the convert,
		 * that uuid belongs to the new thin LV, and a new LV with
		 * a new uuid exists as the non-thin, readonly external LV.
		 * We'd need to remove the lock for the previous uuid
		 * (the new thin LV will have no lock), and create a new
		 * lock for the new LV uuid used by the external LV.
		 */
		log_error("Can't use lock_type %s LV as external origin.",
			  lv->vg->lock_type);
		return 0;
	}

	dm_list_init(&lvc.tags);

	if (!pool_supports_external_origin(first_seg(pool_lv), lv))
		return_0;

	if (!(lvc.segtype = get_segtype_from_string(cmd, SEG_TYPE_NAME_THIN)))
		return_0;

	if (!archive(vg))
		return_0;

	/* New thin LV needs to be created (all messages sent to pool) */
	if (!(torigin_lv = lv_create_single(vg, &lvc)))
		return_0;

	/* Deactivate prepared Thin LV */
	if (!deactivate_lv(cmd, torigin_lv)) {
		log_error("Aborting. Unable to deactivate new LV. "
			  "Manual intervention required.");
		return 0;
	}

	/*
	 * Crashing till this point will leave plain thin volume
	 * which could be easily removed by the user after i.e. power-off
	 */

	if (!swap_lv_identifiers(cmd, torigin_lv, lv)) {
		stack;
		goto revert_new_lv;
	}

	/* Preserve read-write status of original LV here */
	torigin_lv->status |= (lv->status & LVM_WRITE);

	if (!attach_thin_external_origin(first_seg(torigin_lv), lv)) {
		stack;
		goto revert_new_lv;
	}

	if (!lv_update_and_reload(torigin_lv)) {
		stack;
		goto deactivate_and_revert_new_lv;
	}

	log_print_unless_silent("Converted %s to thin volume with "
				"external origin %s.",
				display_lvname(torigin_lv),
				display_lvname(lv));

	return 1;

deactivate_and_revert_new_lv:
	if (!swap_lv_identifiers(cmd, torigin_lv, lv))
		stack;

	if (!deactivate_lv(cmd, torigin_lv)) {
		log_error("Unable to deactivate failed new LV. "
			  "Manual intervention required.");
		return 0;
	}

	if (!detach_thin_external_origin(first_seg(torigin_lv)))
		return_0;

revert_new_lv:
	/* FIXME Better to revert to backup of metadata? */
	if (!lv_remove(torigin_lv) || !vg_write(vg) || !vg_commit(vg))
		log_error("Manual intervention may be required to remove "
			  "abandoned LV(s) before retrying.");
	else
		backup(vg);

	return 0;
}

static int _lvconvert_update_pool_params(struct logical_volume *pool_lv,
					 struct lvconvert_params *lp)
{
	if (lp->pool_metadata_size &&
	    !(lp->pool_metadata_extents =
	      extents_from_size(pool_lv->vg->cmd, lp->pool_metadata_size, pool_lv->vg->extent_size)))
		return_0;

	return update_pool_params(lp->segtype,
				  pool_lv->vg,
				  lp->target_attr,
				  lp->passed_args,
				  pool_lv->le_count,
				  &lp->pool_metadata_extents,
				  &lp->thin_chunk_size_calc_policy,
				  &lp->chunk_size,
				  &lp->discards,
				  &lp->zero);
}

/*
 * Converts a data lv and a metadata lv into a thin or cache pool lv.
 *
 * Thin lvconvert version which
 *  rename metadata
 *  convert/layers thinpool over data
 *  attach metadata
 *
 * pool_lv might or might not already be a pool.
 */
static int _lvconvert_pool(struct cmd_context *cmd,
			   struct logical_volume *pool_lv,
			   struct lvconvert_params *lp)
{
	int r = 0;
	const char *old_name;
	struct lv_segment *seg;
	struct volume_group *vg = pool_lv->vg;
	struct logical_volume *data_lv;
	struct logical_volume *metadata_lv = NULL;
	struct logical_volume *pool_metadata_lv;
	char *lockd_data_args = NULL;
	char *lockd_meta_args = NULL;
	char *lockd_data_name = NULL;
	char *lockd_meta_name = NULL;
	struct id lockd_data_id;
	struct id lockd_meta_id;
	char metadata_name[NAME_LEN], data_name[NAME_LEN];
	int activate_pool;

	if (lp->pool_data_name) {
		if ((lp->thin || lp->cache) &&
		    !strcmp(lp->pool_data_name, pool_lv->name)) {
			log_error("Converted volume %s and pool volume must differ.",
				  display_lvname(pool_lv));
			return 0;
		}
		if (!(pool_lv = find_lv(vg, lp->pool_data_name))) {
			log_error("Unknown pool data LV %s.", lp->pool_data_name);
			return 0;
		}
	}

	/* An existing LV needs to have its lock freed once it becomes a data LV. */
	if (is_lockd_type(vg->lock_type) && !lv_is_pool(pool_lv) && pool_lv->lock_args) {
		lockd_data_args = dm_pool_strdup(cmd->mem, pool_lv->lock_args);
		lockd_data_name = dm_pool_strdup(cmd->mem, pool_lv->name);
		memcpy(&lockd_data_id, &pool_lv->lvid.id[1], sizeof(struct id));
	}

	if (!lv_is_visible(pool_lv)) {
		log_error("Can't convert internal LV %s.", display_lvname(pool_lv));
		return 0;
	}

	if (lv_is_locked(pool_lv)) {
		log_error("Can't convert locked LV %s.", display_lvname(pool_lv));
		return 0;
	}

	if (lv_is_thin_pool(pool_lv) && (segtype_is_cache_pool(lp->segtype) || lp->cache)) {
		log_error("Can't convert thin pool LV %s.", display_lvname(pool_lv));
		return 0;
	}

	if (lv_is_cache(pool_lv) && !segtype_is_thin_pool(lp->segtype)) {
		log_error("Cached LV %s could be only converted into a thin pool volume.",
			  display_lvname(pool_lv));
		return 0;
	}

	if (lv_is_cache_pool(pool_lv) && (segtype_is_thin_pool(lp->segtype) || lp->thin)) {
		log_error("Cannot convert cache pool %s as pool data volume.",
			  display_lvname(pool_lv));
		return 0;
	}

	if (lv_is_mirror(pool_lv)) {
		log_error("Mirror logical volumes cannot be used as pools.");
		log_print_unless_silent("Try \"%s\" segment type instead.", SEG_TYPE_NAME_RAID1);
		return 0;
	}

	/*
	 * Only linear, striped and raid supported.
	 * FIXME Tidy up all these type restrictions.
	 */
	if (!lv_is_pool(pool_lv) &&
	    (lv_is_thin_type(pool_lv) ||
	     lv_is_cow(pool_lv) || lv_is_merging_cow(pool_lv) ||
	     lv_is_origin(pool_lv) ||lv_is_merging_origin(pool_lv) ||
	     lv_is_external_origin(pool_lv) ||
	     lv_is_virtual(pool_lv))) {
		log_error("Pool data LV %s is of an unsupported type.", display_lvname(pool_lv));
		return 0;
	}

	if (lp->pool_metadata_name) {
		if (!(lp->pool_metadata_lv = find_lv(vg, lp->pool_metadata_name))) {
			log_error("Unknown pool metadata LV %s.", lp->pool_metadata_name);
			return 0;
		}
		lp->pool_metadata_extents = lp->pool_metadata_lv->le_count;
		metadata_lv = lp->pool_metadata_lv;

		/* An existing LV needs to have its lock freed once it becomes a meta LV. */
		if (is_lockd_type(vg->lock_type) && metadata_lv->lock_args) {
			lockd_meta_args = dm_pool_strdup(cmd->mem, metadata_lv->lock_args);
			lockd_meta_name = dm_pool_strdup(cmd->mem, metadata_lv->name);
			memcpy(&lockd_meta_id, &metadata_lv->lvid.id[1], sizeof(struct id));
		}

		if (metadata_lv == pool_lv) {
			log_error("Can't use same LV for pool data and metadata LV %s.",
				  display_lvname(metadata_lv));
			return 0;
		}

		if (!lv_is_visible(metadata_lv)) {
			log_error("Can't convert internal LV %s.",
				  display_lvname(metadata_lv));
			return 0;
		}

		if (lv_is_locked(metadata_lv)) {
			log_error("Can't convert locked LV %s.",
				  display_lvname(metadata_lv));
			return 0;
		}

		if (lv_is_mirror(metadata_lv)) {
			log_error("Mirror logical volumes cannot be used for pool metadata.");
			log_print_unless_silent("Try \"%s\" segment type instead.", SEG_TYPE_NAME_RAID1);
			return 0;
		}

		/* FIXME Tidy up all these type restrictions. */
		if (lv_is_cache_type(metadata_lv) ||
		    lv_is_thin_type(metadata_lv) ||
		    lv_is_cow(metadata_lv) || lv_is_merging_cow(metadata_lv) ||
		    lv_is_origin(metadata_lv) || lv_is_merging_origin(metadata_lv) ||
		    lv_is_external_origin(metadata_lv) ||
		    lv_is_virtual(metadata_lv)) {
			log_error("Pool metadata LV %s is of an unsupported type.",
				  display_lvname(metadata_lv));
			return 0;
		}

		if (!lv_is_pool(pool_lv)) {
			if (!_lvconvert_update_pool_params(pool_lv, lp))
				return_0;

			if (lp->pool_metadata_extents > metadata_lv->le_count) {
				log_error("Logical volume %s is too small for metadata.",
					  display_lvname(metadata_lv));
				return 0;
			}
		}
	}

	if (lv_is_pool(pool_lv)) {
		lp->pool_data_lv = pool_lv;

		if (!metadata_lv) {
			if (arg_from_list_is_set(cmd, "is invalid with existing pool",
						 chunksize_ARG, discards_ARG,
						 zero_ARG, poolmetadatasize_ARG, -1))
				return_0;

			if (lp->thin || lp->cache)
				/* already pool, can continue converting volume */
				return 1;

			log_error("LV %s is already pool.", display_lvname(pool_lv));
			return 0;
		}

		if (lp->thin || lp->cache) {
			log_error("--%s and pool metadata swap is not supported.",
				  lp->thin ? "thin" : "cache");
			return 0;
		}

		/* FIXME cache pool */
		if (lv_is_thin_pool(pool_lv) && pool_is_active(pool_lv)) {
			/* If any volume referencing pool active - abort here */
			log_error("Cannot convert pool %s with active volumes.",
				  display_lvname(pool_lv));
			return 0;
		}

		lp->passed_args |= PASS_ARG_CHUNK_SIZE | PASS_ARG_DISCARDS | PASS_ARG_ZERO;
		seg = first_seg(pool_lv);

		/* Normally do NOT change chunk size when swapping */
		if (arg_count(cmd, chunksize_ARG) &&
		    (lp->chunk_size != seg->chunk_size) &&
		    !dm_list_empty(&pool_lv->segs_using_this_lv)) {
			if (lp->force == PROMPT) {
				log_error("Chunk size can be only changed with --force. Conversion aborted.");
				return 0;
			}
			log_warn("WARNING: Changing chunk size %s to "
				 "%s for %s pool volume.",
				 display_size(cmd, seg->chunk_size),
				 display_size(cmd, lp->chunk_size),
				 display_lvname(pool_lv));
			/* Ok, user has likely some serious reason for this */
			if (!lp->yes &&
			    yes_no_prompt("Do you really want to change chunk size "
					  "for %s pool volume? [y/n]: ",
					  display_lvname(pool_lv)) == 'n') {
				log_error("Conversion aborted.");
				return 0;
			}
		} else
			lp->chunk_size = seg->chunk_size;

		if (!_lvconvert_update_pool_params(pool_lv, lp))
			return_0;

		if (metadata_lv->le_count < lp->pool_metadata_extents)
			log_print_unless_silent("Continuing with swap...");

		if (!arg_count(cmd, discards_ARG))
			lp->discards = seg->discards;
		if (!arg_count(cmd, zero_ARG))
			lp->zero = seg->zero_new_blocks;

		if (!lp->yes &&
		    yes_no_prompt("Do you want to swap metadata of %s "
				  "pool with metadata volume %s? [y/n]: ",
				  display_lvname(pool_lv),
				  display_lvname(metadata_lv)) == 'n') {
			log_error("Conversion aborted.");
			return 0;
		}
	} else {
		log_warn("WARNING: Converting logical volume %s%s%s to pool's data%s.",
			 display_lvname(pool_lv),
			 metadata_lv ? " and " : "",
			 metadata_lv ? display_lvname(metadata_lv) : "",
			 metadata_lv ? " and metadata volumes" : " volume");
		log_warn("THIS WILL DESTROY CONTENT OF LOGICAL VOLUME (filesystem etc.)");

		if (!lp->yes &&
		    yes_no_prompt("Do you really want to convert %s%s%s? [y/n]: ",
				  display_lvname(pool_lv),
				  metadata_lv ? " and " : "",
				  metadata_lv ? display_lvname(metadata_lv) : "") == 'n') {
			log_error("Conversion aborted.");
			return 0;
		}
	}

	if (segtype_is_cache_pool(lp->segtype))
		activate_pool = 0; /* Cannot activate cache pool */
	else
		/* Allow to have only thinpool active and restore it's active state */
		activate_pool = lv_is_active(pool_lv);

	if ((dm_snprintf(metadata_name, sizeof(metadata_name), "%s%s",
			 pool_lv->name,
			 (segtype_is_cache_pool(lp->segtype)) ?
			  "_cmeta" : "_tmeta") < 0) ||
	    (dm_snprintf(data_name, sizeof(data_name), "%s%s",
			 pool_lv->name,
			 (segtype_is_cache_pool(lp->segtype)) ?
			 "_cdata" : "_tdata") < 0)) {
		log_error("Failed to create internal lv names, "
			  "pool name is too long.");
		return 0;
	}

	if (!metadata_lv) {
		if (!_lvconvert_update_pool_params(pool_lv, lp))
			return_0;

		if (!get_stripe_params(cmd, &lp->stripes, &lp->stripe_size))
			return_0;

		if (!archive(vg))
			return_0;

		if (!(metadata_lv = alloc_pool_metadata(pool_lv, metadata_name,
							lp->read_ahead, lp->stripes,
							lp->stripe_size,
							lp->pool_metadata_extents,
							lp->alloc, lp->pvh)))
			return_0;
	} else {
		if (!deactivate_lv(cmd, metadata_lv)) {
			log_error("Aborting. Failed to deactivate %s.",
				  display_lvname(metadata_lv));
			return 0;
		}

		if (!archive(vg))
			return_0;

		/* Swap normal LV with pool's metadata LV ? */
		if (lv_is_pool(pool_lv)) {
			/* Swap names between old and new metadata LV */
			seg = first_seg(pool_lv);
			if (!detach_pool_metadata_lv(seg, &pool_metadata_lv))
				return_0;
			old_name = metadata_lv->name;
			if (!lv_rename_update(cmd, metadata_lv, "pvmove_tmeta", 0))
				return_0;
			if (!lv_rename_update(cmd, pool_metadata_lv, old_name, 0))
				return_0;

			goto mda_write;
		}

		metadata_lv->status |= LV_TEMPORARY;
		if (!activate_lv_local(cmd, metadata_lv)) {
			log_error("Aborting. Failed to activate metadata lv.");
			return 0;
		}

		if (!wipe_lv(metadata_lv, (struct wipe_params) { .do_zero = 1 })) {
			log_error("Aborting. Failed to wipe metadata lv.");
			return 0;
		}
	}

	/* We are changing target type, so deactivate first */
	if (!deactivate_lv(cmd, metadata_lv)) {
		log_error("Aborting. Failed to deactivate metadata lv. "
			  "Manual intervention required.");
		return 0;
	}

	if (!deactivate_lv(cmd, pool_lv)) {
		log_error("Aborting. Failed to deactivate logical volume %s.",
			  display_lvname(pool_lv));
		return 0;
	}

	data_lv = pool_lv;
	old_name = data_lv->name; /* Use for pool name */
	/*
	 * Since we wish to have underlaying devs to match _[ct]data
	 * rename data LV to match pool LV subtree first,
	 * also checks for visible LV.
	 */
	/* FIXME: any more types prohibited here? */
	if (!lv_rename_update(cmd, data_lv, data_name, 0))
		return_0;

	if (!(pool_lv = lv_create_empty(old_name, NULL,
					((segtype_is_cache_pool(lp->segtype)) ?
					 CACHE_POOL : THIN_POOL) |
					VISIBLE_LV | LVM_READ | LVM_WRITE,
					ALLOC_INHERIT, vg))) {
		log_error("Creation of pool LV failed.");
		return 0;
	}

	/* Allocate a new pool segment */
	if (!(seg = alloc_lv_segment(lp->segtype, pool_lv, 0, data_lv->le_count,
				     pool_lv->status, 0, NULL, 1,
				     data_lv->le_count, 0, 0, 0, NULL)))
		return_0;

	/* Add the new segment to the layer LV */
	dm_list_add(&pool_lv->segments, &seg->list);
	pool_lv->le_count = data_lv->le_count;
	pool_lv->size = data_lv->size;

	if (!attach_pool_data_lv(seg, data_lv))
		return_0;

	/*
	 * Create a new lock for a thin pool LV.  A cache pool LV has no lock.
	 * Locks are removed from existing LVs that are being converted to
	 * data and meta LVs (they are unlocked and deleted below.)
	 */
	if (is_lockd_type(vg->lock_type)) {
		if (segtype_is_cache_pool(lp->segtype)) {
			data_lv->lock_args = NULL;
			metadata_lv->lock_args = NULL;
		} else {
			data_lv->lock_args = NULL;
			metadata_lv->lock_args = NULL;

			if (!strcmp(vg->lock_type, "sanlock"))
				pool_lv->lock_args = "pending";
			else if (!strcmp(vg->lock_type, "dlm"))
				pool_lv->lock_args = "dlm";
			/* The lock_args will be set in vg_write(). */
		}
	}

	/* FIXME: revert renamed LVs in fail path? */
	/* FIXME: any common code with metadata/thin_manip.c  extend_pool() ? */

	seg->transaction_id = 0;

mda_write:
	seg->chunk_size = lp->chunk_size;
	seg->discards = lp->discards;
	seg->zero_new_blocks = lp->zero ? 1 : 0;

	if (lp->cache_mode &&
	    !cache_set_mode(seg, lp->cache_mode))
		return_0;

	if ((lp->policy_name || lp->policy_settings) &&
	    !cache_set_policy(seg, lp->policy_name, lp->policy_settings))
		return_0;

	/* Rename deactivated metadata LV to have _tmeta suffix */
	/* Implicit checks if metadata_lv is visible */
	if (lp->pool_metadata_name &&
	    !lv_rename_update(cmd, metadata_lv, metadata_name, 0))
		return_0;

	if (!attach_pool_metadata_lv(seg, metadata_lv))
		return_0;

	if (!handle_pool_metadata_spare(vg, metadata_lv->le_count,
					lp->pvh, lp->poolmetadataspare))
		return_0;

	if (!vg_write(vg) || !vg_commit(vg))
		return_0;

	if (seg->zero_new_blocks &&
	    seg->chunk_size  >= DEFAULT_THIN_POOL_CHUNK_SIZE_PERFORMANCE * 2)
		log_warn("WARNING: Pool zeroing and large %s chunk size slows down "
			 "provisioning.", display_size(cmd, seg->chunk_size));

	if (activate_pool && !lockd_lv(cmd, pool_lv, "ex", LDLV_PERSISTENT)) {
		log_error("Failed to lock pool LV %s/%s", vg->name, pool_lv->name);
		goto out;
	}

	if (activate_pool &&
	    !activate_lv_excl(cmd, pool_lv)) {
		log_error("Failed to activate pool logical volume %s.",
			  display_lvname(pool_lv));
		/* Deactivate subvolumes */
		if (!deactivate_lv(cmd, seg_lv(seg, 0)))
			log_error("Failed to deactivate pool data logical volume.");
		if (!deactivate_lv(cmd, seg->metadata_lv))
			log_error("Failed to deactivate pool metadata logical volume.");
		goto out;
	}

	r = 1;
	lp->pool_data_lv = pool_lv;

out:
	backup(vg);

	if (r)
		log_print_unless_silent("Converted %s to %s pool.",
					display_lvname(pool_lv),
					(segtype_is_cache_pool(lp->segtype)) ?
					"cache" : "thin");

	/*
	 * Unlock and free the locks from existing LVs that became pool data
	 * and meta LVs.
	 */
	if (lockd_data_name) {
		if (!lockd_lv_name(cmd, vg, lockd_data_name, &lockd_data_id, lockd_data_args, "un", LDLV_PERSISTENT))
			log_error("Failed to unlock pool data LV %s/%s", vg->name, lockd_data_name);
		lockd_free_lv(cmd, vg, lockd_data_name, &lockd_data_id, lockd_data_args);
	}

	if (lockd_meta_name) {
		if (!lockd_lv_name(cmd, vg, lockd_meta_name, &lockd_meta_id, lockd_meta_args, "un", LDLV_PERSISTENT))
			log_error("Failed to unlock pool metadata LV %s/%s", vg->name, lockd_meta_name);
		lockd_free_lv(cmd, vg, lockd_meta_name, &lockd_meta_id, lockd_meta_args);
	}

	return r;
#if 0
revert_new_lv:
        /* TBD */
	if (!lp->pool_metadata_lv_name) {
		if (!deactivate_lv(cmd, metadata_lv)) {
			log_error("Failed to deactivate metadata lv.");
			return 0;
		}
		if (!lv_remove(metadata_lv) || !vg_write(vg) || !vg_commit(vg))
			log_error("Manual intervention may be required to remove "
				  "abandoned LV(s) before retrying.");
		else
			backup(vg);
	}

	return 0;
#endif
}

/*
 * Convert origin into a cache LV by attaching a cache pool.
 */
static int _lvconvert_cache(struct cmd_context *cmd,
			    struct logical_volume *origin_lv,
			    struct lvconvert_params *lp)
{
	struct logical_volume *pool_lv = lp->pool_data_lv;
	struct logical_volume *cache_lv;

	if (!validate_lv_cache_create_pool(pool_lv))
		return_0;

	if (!archive(origin_lv->vg))
		return_0;

	if (!(cache_lv = lv_cache_create(pool_lv, origin_lv)))
		return_0;

	if (!cache_set_mode(first_seg(cache_lv), lp->cache_mode))
		return_0;

	if (!cache_set_policy(first_seg(cache_lv), lp->policy_name, lp->policy_settings))
		return_0;

	cache_check_for_warns(first_seg(cache_lv));

	if (!lv_update_and_reload(cache_lv))
		return_0;

	log_print_unless_silent("Logical volume %s is now cached.",
				display_lvname(cache_lv));

	return 1;
}

static int _lvconvert_single(struct cmd_context *cmd, struct logical_volume *lv,
			     void *handle)
{
	struct logical_volume *origin = NULL;
	struct lvconvert_params *lp = handle;
	struct dm_list *failed_pvs;

	if (lv_is_locked(lv)) {
		log_error("Cannot convert locked LV %s.", display_lvname(lv));
		return ECMD_FAILED;
	}

	if (lv_is_cow(lv) && !lp->merge && !lp->splitsnapshot) {
		log_error("Cannot convert snapshot logical volume %s.",
			  display_lvname(lv));
		return ECMD_FAILED;
	}

	if (lv_is_pvmove(lv)) {
		log_error("Unable to convert pvmove LV %s.",
			  display_lvname(lv));
		return ECMD_FAILED;
	}

	if (lp->splitsnapshot) {
		if (!_lvconvert_splitsnapshot(cmd, lv, lp))
			return_ECMD_FAILED;
		return ECMD_PROCESSED;
	}

	if (lp->splitcache) {
		if (!_lvconvert_splitcache(cmd, lv, lp))
			return_ECMD_FAILED;
		return ECMD_PROCESSED;
	}

	if (lp->split) {
		if (!_lvconvert_split(cmd, lv, lp))
			return_ECMD_FAILED;
		return ECMD_PROCESSED;
	}

	if (lp->uncache) {
		if (!_lvconvert_uncache(cmd, lv, lp))
			return_ECMD_FAILED;
		return ECMD_PROCESSED;
	}

	/* Validate origin prior we start conversion of pool */
	if (lp->cache &&
	    !validate_lv_cache_create_origin(lv))
		return_ECMD_FAILED;

	if (lp->thin) {
		if (lv_is_cache_type(lv) ||
		    lv_is_pool(lv) ||
		    lv_is_thin_pool_data(lv) ||
		    lv_is_thin_pool_metadata(lv)) {
			log_error("Can't convert %s %s to external origin.",
				  first_seg(lv)->segtype->name,
				  display_lvname(lv));
			return ECMD_FAILED;
		}
	}

	if (lp->repair) {
		if (lv_is_pool(lv)) {
			if (lv_is_cache_pool(lv)) {
				log_error("Repair for cache pool %s not yet implemented.",
					  display_lvname(lv));
				return ECMD_FAILED;
			}
			if (!_lvconvert_thin_pool_repair(cmd, lv, lp))
				return_ECMD_FAILED;
			return ECMD_PROCESSED;
		}
		if (!lv_is_mirrored(lv) && !lv_is_raid(lv)) {
			if (arg_count(cmd, usepolicies_ARG))
				return ECMD_PROCESSED; /* nothing to be done here */
			log_error("Cannot repair logical volume %s of segtype %s.",
				  display_lvname(lv), lvseg_name(first_seg(lv)));
			return ECMD_FAILED;
		}
	}

	/* forward splitmirror operations to the cache origin, which may be raid
	 * or old-style mirror */
	if (arg_count(cmd, splitmirrors_ARG) && lv_is_cache_type(lv)
	    && (origin = seg_lv(first_seg(lv), 0)) && lv_is_cache_origin(origin)) {
		log_warn("WARNING: Selected operation does not work with cache-type LVs.");
		log_warn("WARNING: Proceeding using the cache origin volume %s instead.",
			 display_lvname(origin));
		lv = origin;
	}

	if (!lp->segtype) {
		/* segtype not explicitly set in _read_params */
		lp->segtype = first_seg(lv)->segtype;

		/*
		 * If we are converting to mirror/raid1 and
		 * the segtype was not specified, then we need
		 * to consult the default.
		 */
		if (arg_count(cmd, mirrors_ARG) && !lv_is_mirrored(lv)) {
			if (!(lp->segtype = get_segtype_from_string(cmd, find_config_tree_str(cmd, global_mirror_segtype_default_CFG, NULL))))
				return_ECMD_FAILED;
		}
	}
	if (lp->merge) {
		if ((lv_is_thin_volume(lv) && !_lvconvert_merge_thin_snapshot(cmd, lv, lp)) ||
		    (!lv_is_thin_volume(lv) && !_lvconvert_merge_old_snapshot(cmd, lv, lp))) {
			log_print_unless_silent("Unable to merge volume %s into its origin.",
						display_lvname(lv));
			return ECMD_FAILED;
		}
	} else if (lp->snapshot) {
		if (!_lvconvert_snapshot(cmd, lv, lp))
			return_ECMD_FAILED;
	} else if (segtype_is_pool(lp->segtype) || lp->thin || lp->cache) {
		if (!_lvconvert_pool(cmd, lv, lp))
			return_ECMD_FAILED;

		if ((lp->thin && !_lvconvert_thin(cmd, lv, lp)) ||
		    (lp->cache && !_lvconvert_cache(cmd, lv, lp)))
			return_ECMD_FAILED;
	} else if (segtype_is_raid(lp->segtype) ||
		   (lv->status & RAID) || lp->merge_mirror) {
		if (!archive(lv->vg))
			return_ECMD_FAILED;

		if (!_lvconvert_raid(lv, lp))
			return_ECMD_FAILED;

		if (!(failed_pvs = _failed_pv_list(lv->vg)))
			return_ECMD_FAILED;

		/* If repairing and using policies, remove missing PVs from VG */
		if (lp->repair && arg_count(cmd, usepolicies_ARG))
			_remove_missing_empty_pv(lv->vg, failed_pvs);
	} else if (arg_count(cmd, mirrors_ARG) ||
		   arg_count(cmd, splitmirrors_ARG) ||
		   lv_is_mirrored(lv)) {
		if (!archive(lv->vg))
			return_ECMD_FAILED;

		if (!_lvconvert_mirrors(cmd, lv, lp))
			return_ECMD_FAILED;

		if (!(failed_pvs = _failed_pv_list(lv->vg)))
			return_ECMD_FAILED;

		/* If repairing and using policies, remove missing PVs from VG */
		if (lp->repair && arg_count(cmd, usepolicies_ARG))
			_remove_missing_empty_pv(lv->vg, failed_pvs);
	}

	return ECMD_PROCESSED;
}

static struct convert_poll_id_list* _convert_poll_id_list_create(struct cmd_context *cmd,
								 const struct logical_volume *lv)
{
	struct convert_poll_id_list *idl = (struct convert_poll_id_list *) dm_pool_alloc(cmd->mem, sizeof(struct convert_poll_id_list));

	if (!idl) {
		log_error("Convert poll ID list allocation failed.");
		return NULL;
	}

	if (!(idl->id = _create_id(cmd, lv->vg->name, lv->name, lv->lvid.s))) {
		dm_pool_free(cmd->mem, idl);
		return_NULL;
	}

	idl->is_merging_origin = lv_is_merging_origin(lv);
	idl->is_merging_origin_thin = idl->is_merging_origin && seg_is_thin_volume(find_snapshot(lv));

	return idl;
}

static int _convert_and_add_to_poll_list(struct cmd_context *cmd,
					 struct lvconvert_params *lp,
					 struct logical_volume *lv)
{
	int ret;
	struct lvinfo info;
	struct convert_poll_id_list *idl;

	/* _lvconvert_single() call may alter the reference in lp->lv_to_poll */
	if ((ret = _lvconvert_single(cmd, lv, lp)) != ECMD_PROCESSED)
		stack;
	else if (lp->need_polling) {
		if (!lv_info(cmd, lp->lv_to_poll, 0, &info, 0, 0) || !info.exists)
			log_print_unless_silent("Conversion starts after activation.");
		else {
			if (!(idl = _convert_poll_id_list_create(cmd, lp->lv_to_poll)))
				return_ECMD_FAILED;
			dm_list_add(&lp->idls, &idl->list);
		}
	}

	return ret;
}

static int lvconvert_single(struct cmd_context *cmd, struct lvconvert_params *lp)
{
	struct logical_volume *lv;
	struct volume_group *vg;
	int ret = ECMD_FAILED;
	int saved_ignore_suspended_devices = ignore_suspended_devices();
	uint32_t lockd_state = 0;

	if (lp->repair || lp->uncache) {
		init_ignore_suspended_devices(1);
		cmd->handles_missing_pvs = 1;
	}

	/* Unlock on error paths not required, it's automatic when command exits. */
	if (!lockd_vg(cmd, lp->vg_name, "ex", 0, &lockd_state))
		goto_out;

	vg = vg_read(cmd, lp->vg_name, NULL, READ_FOR_UPDATE, lockd_state);
	if (vg_read_error(vg)) {
		release_vg(vg);
		goto_out;
	}

	if (test_mode() && is_lockd_type(vg->lock_type)) {
		log_error("Test mode is not yet supported with lock type %s",
			  vg->lock_type);
		unlock_and_release_vg(cmd, vg, lp->vg_name);
		goto_out;
	}

	if (!(lv = find_lv(vg, lp->lv_name))) {
		log_error("Can't find LV %s in VG %s", lp->lv_name, lp->vg_name);
		unlock_and_release_vg(cmd, vg, lp->vg_name);
		goto_out;
	}

	/*
	 * Request a transient lock.  If the LV is active, it has a persistent
	 * lock already, and this request does nothing.  If the LV is not
	 * active, this acquires a transient lock that will be released when
	 * the command exits.
	 */
	if (!lockd_lv(cmd, lv, "ex", 0))
		goto_bad;

	/*
	 * lp->pvh holds the list of PVs available for allocation or removal
	 */
	if (lp->pv_count) {
		if (!(lp->pvh = create_pv_list(cmd->mem, vg, lp->pv_count, lp->pvs, 0)))
			goto_bad;
	} else
		lp->pvh = &vg->pvs;

	if (lp->replace_pv_count &&
	    !(lp->replace_pvh = create_pv_list(cmd->mem, vg,
					       lp->replace_pv_count,
					       lp->replace_pvs, 0)))
			goto_bad;

	lp->lv_to_poll = lv;
	ret = _convert_and_add_to_poll_list(cmd, lp, lv);

bad:
	unlock_vg(cmd, lp->vg_name);

	/* Unlock here so it's not held during polling. */
	if (!lockd_vg(cmd, lp->vg_name, "un", 0, &lockd_state))
		stack;

	release_vg(vg);
out:
	init_ignore_suspended_devices(saved_ignore_suspended_devices);
	return ret;
}

static int _lvconvert_merge_single(struct cmd_context *cmd, struct logical_volume *lv,
				   struct processing_handle *handle)
{
	struct lvconvert_params *lp = (struct lvconvert_params *) handle->custom_handle;

	lp->lv_to_poll = lv;

	return _convert_and_add_to_poll_list(cmd, lp, lv);
}

int lvconvert(struct cmd_context * cmd, int argc, char **argv)
{
	int poll_ret, ret;
	struct convert_poll_id_list *idl;
	struct lvconvert_params lp = {
		.target_attr = ~0,
		.idls = DM_LIST_HEAD_INIT(lp.idls),
	};
	struct processing_handle *handle = init_processing_handle(cmd);

	if (!handle) {
		log_error("Failed to initialize processing handle.");
		return ECMD_FAILED;
	}

	handle->custom_handle = &lp;

	if (!_read_params(cmd, argc, argv, &lp)) {
		ret = EINVALID_CMD_LINE;
		goto_out;
	}

	if (lp.merge)
		ret = process_each_lv(cmd, argc, argv, READ_FOR_UPDATE, handle,
				      &_lvconvert_merge_single);
	else
		ret = lvconvert_single(cmd, &lp);

	dm_list_iterate_items(idl, &lp.idls) {
		poll_ret = _lvconvert_poll_by_id(cmd, idl->id,
						 lp.wait_completion ? 0 : 1U,
						 idl->is_merging_origin,
						 idl->is_merging_origin_thin);
		if (poll_ret > ret)
			ret = poll_ret;
	}

out:
	if (lp.policy_settings)
		dm_config_destroy(lp.policy_settings);

	destroy_processing_handle(cmd, handle);

	return ret;
}