lvconvert: use command defs for thin and cache

This is a new explicit version of 'lvconvert LV'
which has never been well defined or understood.

test/shell/lvconvert-mirror.sh

@@ -85,12 +85,9 @@ offset=$(( offset + 2 ))
 # update in case  mirror ever gets faster and allows parallel read
 aux delay_dev "$dev2" 0 2000 ${offset}:1
 lvcreate -aey -l5 -Zn -Wn --type mirror --regionsize 16K -m2 -n $lv1 $vg "$dev1" "$dev2" "$dev4" "$dev3:$DEVRANGE"
-# FIXME: add a new explicit option to define the polling behavior
-# done here with 'lvconvert vg/lv'.  That option can specify
-# that the command succeeds even if the LV doesn't need polling.
 should not lvconvert -m-1 $vg/$lv1 "$dev1"
 aux enable_dev "$dev2"
-should lvconvert $vg/$lv1 # wait
+lvconvert --startpoll $vg/$lv1 || true # wait
 lvconvert -m2 $vg/$lv1 "$dev1" "$dev2" "$dev4" "$dev3:0" # If the above "should" failed...
 
 aux wait_for_sync $vg $lv1
@@ -116,7 +113,7 @@ LVM_TEST_TAG="kill_me_$PREFIX" lvconvert -m+1 -b $vg/$lv1 "$dev4"
 # Next convert should fail b/c we can't have 2 at once
 should not lvconvert -m+1 $vg/$lv1 "$dev5"
 aux enable_dev "$dev4"
-should lvconvert $vg/$lv1 # wait
+lvconvert --startpoll $vg/$lv1 || true # wait
 lvconvert -m2 $vg/$lv1 # In case the above "should" actually failed
 
 check mirror $vg $lv1 "$dev3"
@@ -159,7 +156,7 @@ lvcreate -aey -l2 --type mirror -m1 -n $lv1 $vg "$dev1" "$dev2" "$dev3:$DEVRANGE
 lvchange -an $vg/$lv1
 lvconvert -m+1 $vg/$lv1 "$dev4"
 lvchange -aey $vg/$lv1
-should lvconvert $vg/$lv1 # wait
+lvconvert --startpoll $vg/$lv1 || true # wait
 check mirror $vg $lv1 "$dev3"
 check mirror_no_temporaries $vg $lv1
 lvremove -ff $vg
@@ -171,7 +168,7 @@ lvremove -ff $vg
 lvcreate -aey -l2 --type mirror -m1 -n $lv1 $vg "$dev1" "$dev2" "$dev3:$DEVRANGE"
 LVM_TEST_TAG="kill_me_$PREFIX" lvconvert -m+1 -b $vg/$lv1 "$dev4"
 lvconvert -m-1 $vg/$lv1 "$dev4"
-should lvconvert $vg/$lv1 # wait
+lvconvert --startpoll $vg/$lv1 || true # wait
 
 check mirror $vg $lv1 "$dev3"
 check mirror_no_temporaries $vg $lv1
@@ -182,7 +179,7 @@ lvremove -ff $vg
 lvcreate -aey -l2 --type mirror -m1 -n $lv1 $vg "$dev1" "$dev2" "$dev3:$DEVRANGE"
 LVM_TEST_TAG="kill_me_$PREFIX" lvconvert -m+2 -b $vg/$lv1 "$dev4" "$dev5"
 lvconvert -m-1 $vg/$lv1 "$dev4"
-should lvconvert $vg/$lv1 # wait
+lvconvert --startpoll $vg/$lv1 || true # wait
 
 check mirror $vg $lv1 "$dev3"
 check mirror_no_temporaries $vg $lv1
@@ -195,9 +192,9 @@ LVM_TEST_TAG="kill_me_$PREFIX" lvconvert -m+1 -b $vg/$lv1 "$dev4"
 # FIXME: Extra wait here for mirror upconvert synchronization
 # otherwise we may fail her on parallel upconvert and downconvert
 # lvconvert-mirror-updown.sh tests this errornous case separately
-should lvconvert $vg/$lv1
+lvconvert --startpoll $vg/$lv1 || true
 lvconvert -m-1 $vg/$lv1 "$dev2"
-should lvconvert $vg/$lv1
+lvconvert --startpoll $vg/$lv1 || true
 
 check mirror $vg $lv1 "$dev3"
 check mirror_no_temporaries $vg $lv1
@@ -210,9 +207,9 @@ LVM_TEST_TAG="kill_me_$PREFIX" lvconvert -m+1 -b $vg/$lv1 "$dev4"
 # FIXME: Extra wait here for mirror upconvert synchronization
 # otherwise we may fail her on parallel upconvert and downconvert
 # lvconvert-mirror-updown.sh tests this errornous case separately
-should lvconvert $vg/$lv1
+lvconvert --startpoll $vg/$lv1 || true
 lvconvert -m-1 $vg/$lv1 "$dev2"
-should lvconvert $vg/$lv1
+lvconvert --startpoll $vg/$lv1 || true
 
 check mirror $vg $lv1 "$dev3"
 check mirror_no_temporaries $vg $lv1

test/shell/lvmetad-pvscan-autoactivation-polling.sh

@@ -54,7 +54,7 @@ mkdir test_mnt
 
 setup_merge_ $vg1 $lv1
 mount "$(lvdev_ $vg1 $lv1)" test_mnt
-lvconvert --merge $vg1/$(snap_lv_name_ $lv1)
+lvconvert --mergesnapshot $vg1/$(snap_lv_name_ $lv1)
 umount test_mnt
 vgchange -an $vg1
 

test/shell/snapshot-merge-stack.sh

@@ -34,7 +34,7 @@ snap_and_merge() {
 	SLEEP_PID=$!
 
 	# initiate background merge
-	lvconvert -b --merge $vg/$lv2
+	lvconvert -b --mergesnapshot $vg/$lv2
 
 	lvs -a -o+lv_merging,lv_merge_failed $vg
 	kill $SLEEP_PID

test/shell/snapshot-merge.sh

@@ -51,15 +51,15 @@ mkdir test_mnt
 # test full merge of a single LV
 setup_merge_ $vg $lv1
 
-# make sure lvconvert --merge requires explicit LV listing
-not lvconvert --merge
-lvconvert --merge $vg/$(snap_lv_name_ $lv1)
+# make sure lvconvert --mergesnapshot requires explicit LV listing
+not lvconvert --mergesnapshot
+lvconvert --mergesnapshot $vg/$(snap_lv_name_ $lv1)
 lvremove -f $vg/$lv1
 
 
 # test that an actively merging snapshot may not be removed
 setup_merge_ $vg $lv1
-lvconvert -i+100 --merge --background $vg/$(snap_lv_name_ $lv1)
+lvconvert -i+100 --mergesnapshot --background $vg/$(snap_lv_name_ $lv1)
 not lvremove -f $vg/$(snap_lv_name_ $lv1)
 lvremove -f $vg/$lv1
 
@@ -67,7 +67,7 @@ lvremove -f $vg/$lv1
 # "onactivate merge" test
 setup_merge_ $vg $lv1
 mount "$(lvdev_ $vg $lv1)" test_mnt
-lvconvert --merge $vg/$(snap_lv_name_ $lv1)
+lvconvert --mergesnapshot $vg/$(snap_lv_name_ $lv1)
 # -- refresh LV while FS is still mounted (merge must not start),
 #    verify 'snapshot-origin' target is still being used
 lvchange --refresh $vg/$lv1

test/shell/thin-merge.sh

@@ -102,7 +102,7 @@ lvcreate -s -n snap $vg/$lv1
 lvcreate -s -L10 -n oldsnapof_${lv1} $vg/$lv1
 not lvconvert --merge $vg/snap
 $MKFS "$DM_DEV_DIR/$vg/oldsnapof_${lv1}"
-lvconvert --merge $vg/oldsnapof_${lv1}
+lvconvert --mergesnapshot $vg/oldsnapof_${lv1}
 fsck -n "$DM_DEV_DIR/$vg/$lv1"
 check lv_not_exists $vg oldsnapof_${lv1}
 # Add old snapshot to thin snapshot

tools/args.h

@@ -118,6 +118,7 @@ arg(splitmirrors_ARG, '\0', "splitmirrors", number_VAL, 0, 0)
 arg(splitsnapshot_ARG, '\0', "splitsnapshot", 0, 0, 0)
 arg(showdeprecated_ARG, '\0', "showdeprecated", 0, 0, 0)
 arg(showunsupported_ARG, '\0', "showunsupported", 0, 0, 0)
+arg(startpoll_ARG, '\0', "startpoll", 0, 0, 0)
 arg(stripes_long_ARG, '\0', "stripes", number_VAL, 0, 0)
 arg(syncaction_ARG, '\0', "syncaction", syncaction_VAL, 0, 0)
 arg(sysinit_ARG, '\0', "sysinit", 0, 0, 0)

tools/command-lines.in

@@ -239,8 +239,12 @@ OO_LVCHANGE_META: --addtag Tag, --deltag Tag,
 --minrecoveryrate SizeKB, --maxrecoveryrate SizeKB,
 --writebehind Number, --writemostly WriteMostlyPV, --persistent n
 
+# It's unfortunate that activate needs to be optionally allowed here;
+# it should only be used explicitly, but it's been previously allowed
+# in combination with unrelated metadata changes.
+
 lvchange OO_LVCHANGE_META VG|LV|Tag|Select ...
-OO: OO_LVCHANGE
+OO: --activate Active, OO_LVCHANGE
 ID: lvchange_properties
 DESC: Change a general LV property.
 RULE: all not lv_is_pvmove lv_is_mirror_log lv_is_mirror_image
@@ -256,8 +260,11 @@ RULE: --permission not lv_is_external_origin lv_is_raid_metadata lv_is_raid_imag
 RULE: --alloc --contiguous --metadataprofile --permission --persistent --profile --readahead not lv_is_thick_origin
 RULE: --alloc --discards --zero --cachemode --cachepolicy --cachesettings not lv_is_partial
 
+# It's unfortunate that acativate needs to be optionally allowed here,
+# like above, it was previouly allowed in combination.
+
 lvchange --resync VG|LV_raid_mirror|Tag|Select ...
-OO: OO_LVCHANGE
+OO: --activate Activate, OO_LVCHANGE
 ID: lvchange_resync
 DESC: Resyncronize a mirror or raid LV.
 RULE: all not lv_is_pvmove lv_is_locked
@@ -275,10 +282,9 @@ ID: lvchange_rebuild
 DESC: Reconstruct data on specific PVs of a raid LV.
 RULE: all not LV_raid0
 
-# try removing the META change options from here?
 lvchange --activate Active VG|LV|Tag|Select ...
 OO: --activationmode ActivationMode, --partial, --ignoreactivationskip,
---ignorelockingfailure, --sysinit, OO_LVCHANGE_META, OO_LVCHANGE
+--ignorelockingfailure, --sysinit, OO_LVCHANGE
 ID: lvchange_activate
 DESC: Activate or deactivate an LV.
 
@@ -382,6 +388,8 @@ lvconvert --type thin --thinpool LV LV_linear_striped_raid
 OO: --thin, --originname LV_new, --zero Bool, OO_LVCONVERT_POOL, OO_LVCONVERT
 ID: lvconvert_to_thin_with_external
 DESC: Convert LV to type thin with an external origin.
+RULE: all and lv_is_visible
+RULE: all not lv_is_locked
 
 # alternate form of lvconvert --type thin
 lvconvert --thin --thinpool LV LV_linear_striped_raid
@@ -390,6 +398,8 @@ ID: lvconvert_to_thin_with_external
 DESC: Convert LV to type thin with an external origin
 DESC: (variant, infers --type thin).
 FLAGS: SECONDARY_SYNTAX
+RULE: all and lv_is_visible
+RULE: all not lv_is_locked
 
 ---
 
@@ -398,6 +408,7 @@ OO: --cache, --cachemode CacheMode, --cachepolicy String,
 --cachesettings String, --zero Bool, OO_LVCONVERT_POOL, OO_LVCONVERT
 ID: lvconvert_to_cache_vol
 DESC: Convert LV to type cache.
+RULE: all and lv_is_visible
 
 # alternate form of lvconvert --type cache
 lvconvert --cache --cachepool LV LV_linear_striped_raid_thinpool
@@ -406,6 +417,7 @@ OO: --type cache, --cachemode CacheMode, --cachepolicy String,
 ID: lvconvert_to_cache_vol
 DESC: Convert LV to type cache (variant, infers --type cache).
 FLAGS: SECONDARY_SYNTAX
+RULE: all and lv_is_visible
 
 ---
 
@@ -415,14 +427,18 @@ OO: --stripes_long Number, --stripesize SizeKB,
 OP: PV ...
 ID: lvconvert_to_thinpool
 DESC: Convert LV to type thin-pool.
+RULE: all and lv_is_visible
+RULE: all not lv_is_locked lv_is_origin lv_is_merging_origin lv_is_external_origin lv_is_virtual
 
 # alternate form of lvconvert --type thin-pool
 # deprecated because of non-standard syntax (missing positional arg)
+# Commands in this form are converted to standard form so that
+# the validation of LV types and rules specified above will apply.
 lvconvert --thinpool LV_linear_striped_raid_cache
 OO: --type thin-pool, --stripes_long Number, --stripesize SizeKB,
 --discards Discards, --zero Bool, OO_LVCONVERT_POOL, OO_LVCONVERT
 OP: PV ...
-ID: lvconvert_to_thinpool
+ID: lvconvert_to_thinpool_noarg
 DESC: Convert LV to type thin-pool (variant, use --type thin-pool).
 FLAGS: SECONDARY_SYNTAX
 
@@ -437,10 +453,13 @@ DESC: Convert LV to type cache-pool.
 
 # alternate form of lvconvert --type cache-pool
 # deprecated because of non-standard syntax (missing positional arg)
+# Commands in this form are converted to standard form so that
+# the validation of LV types and rules specified above will apply.
 lvconvert --cachepool LV_linear_striped_raid
 OO: --type cache-pool, OO_LVCONVERT_POOL, OO_LVCONVERT,
 --cachemode CacheMode, --cachepolicy String, --cachesettings String
-ID: lvconvert_to_cachepool
+OP: PV ...
+ID: lvconvert_to_cachepool_noarg
 DESC: Convert LV to type cache-pool (variant, use --type cache-pool).
 FLAGS: SECONDARY_SYNTAX
 
@@ -519,24 +538,32 @@ lvconvert --splitsnapshot LV_snapshot
 OO: OO_LVCONVERT
 ID: lvconvert_split_cow_snapshot
 DESC: Separate a COW snapshot from its origin LV.
-RULE: all not lv_is_locked lv_is_pvmove lv_is_origin lv_is_external_origin lv_is_merging_cow lv_is_vg_writable
+RULE: all not lv_is_locked lv_is_pvmove lv_is_origin lv_is_external_origin lv_is_merging_cow
 
 ---
 
-# NB: an unsual use of position args here
+# NB: an unsual use of position args here, the first pos arg
+# (will become origin LV) is not passed to process_each,
+# the second pos arg (will become cow LV) is given to
+# process_each.  Because the first pos LV is not handled
+# by process_each_lv, it cannot be checked against this
+# command def, so a specific LV type in the first pos
+# will not be checked.
 
 # alternate form of lvconvert --snapshot
-lvconvert --type snapshot LV_linear_striped_raid LV_snapshot
+lvconvert --type snapshot LV LV_linear
 OO: --snapshot, --chunksize SizeKB, --zero Bool, OO_LVCONVERT
 ID: lvconvert_combine_split_snapshot
-DESC: Combine LV with a previously split snapshot LV.
+DESC: Combine a former COW snapshot (second arg) with a former
+DESC: origin LV (first arg) to reverse a splitsnapshot command.
 FLAGS: SECONDARY_SYNTAX
 RULE: all not lv_is_locked lv_is_pvmove
 
-lvconvert --snapshot LV_linear_striped_raid LV_snapshot
+lvconvert --snapshot LV LV_linear
 OO: --type snapshot, --chunksize SizeKB, --zero Bool, OO_LVCONVERT
 ID: lvconvert_combine_split_snapshot
-DESC: Combine LV with a previously split snapshot LV.
+DESC: Combine a former COW snapshot (second arg) with a former
+DESC: origin LV (first arg) to reverse a splitsnapshot command.
 RULE: all not lv_is_locked lv_is_pvmove
 
 ---
@@ -575,13 +602,22 @@ RULE: all not lv_is_locked lv_is_pvmove
 
 ---
 
-# FIXME: add a new option defining this operation, e.g. --poll-mirror
-# The purpose of this command is not entirely clear.
+# This command just (re)starts the polling process on the LV
+# to continue a previous conversion.
 
+lvconvert --startpoll LV_mirror
+OO: OO_LVCONVERT
+ID: lvconvert_start_poll
+DESC: Poll LV to continue conversion.
+RULE: all and lv_is_converting
+
+# alternate form of lvconvert --startpoll, this is only kept
+# for compat since this was how it used to be done.
 lvconvert LV_mirror
 OO: OO_LVCONVERT
-ID: lvconvert_poll_start
-DESC: Poll mirror LV to collapse resync layers.
+ID: lvconvert_start_poll
+DESC: Poll LV to continue conversion.
+RULE: all and lv_is_converting
 FLAGS: SECONDARY_SYNTAX
 
 ---

tools/lv_types.h

@@ -28,5 +28,7 @@ lvt(raid4_LVT, "raid4", NULL)
 lvt(raid5_LVT, "raid5", NULL)
 lvt(raid6_LVT, "raid6", NULL)
 lvt(raid10_LVT, "raid10", NULL)
+lvt(error_LVT, "error", NULL)
+lvt(zero_LVT, "zero", NULL)
 lvt(LVT_COUNT, "", NULL)
 

tools/lvchange.c

@@ -1009,14 +1009,57 @@ static int _lvchange_properties_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_properties_check(struct cmd_context *cmd,
+				     struct logical_volume *lv,
+				     struct processing_handle *handle,
+				     int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			log_error("Operation not permitted (%s %d) on hidden LV %s.",
+				  cmd->command->command_line_id, cmd->command->command_line_enum,
+				  display_lvname(lv));
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_properties_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
+	int ret;
+
 	/*
 	 * A command def rule allows only some options when LV is partial,
 	 * so handles_missing_pvs will only affect those.
 	 */
 	cmd->handles_missing_pvs = 1;
-	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE, NULL, _lvchange_properties_single);
+	ret = process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE,
+			      NULL, &_lvchange_properties_check, &_lvchange_properties_single);
+
+	if (ret != ECMD_PROCESSED)
+		return ret;
+
+	/*
+	 * Unfortunately, lvchange has previously allowed changing an LV
+	 * property and changing LV activation in a single command.  This was
+	 * not a good idea because the behavior/results are hard to predict and
+	 * not possible to sensibly describe.  It's also unnecessary.  So, this
+	 * is here for the sake of compatibility.
+	 *
+	 * This is extremely ugly; activation should always be done separately.
+	 * This is not the full-featured lvchange capability, just the basic
+	 * (the advanced activate options are not provided.)
+	 *
+	 * FIXME: wrap this in a config setting that we can disable by default
+	 * to phase this out?
+	 */
+	if (arg_is_set(cmd, activate_ARG)) {
+		log_warn("WARNING: Combining activation change with other commands is not advised.");
+		ret = lvchange_activate_cmd(cmd, argc, argv);
+	}
+
+	return ret;
 }
 
 static int _lvchange_activate_single(struct cmd_context *cmd,
@@ -1073,6 +1116,22 @@ static int _lvchange_activate_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_activate_check(struct cmd_context *cmd,
+				     struct logical_volume *lv,
+				     struct processing_handle *handle,
+				     int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			log_error("Operation not permitted (%s %d) on hidden LV %s.",
+				  cmd->command->command_line_id, cmd->command->command_line_enum,
+				  display_lvname(lv));
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_activate_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
 	cmd->handles_missing_pvs = 1;
@@ -1089,7 +1148,8 @@ int lvchange_activate_cmd(struct cmd_context *cmd, int argc, char **argv)
 	if (is_change_activating((activation_change_t)arg_uint_value(cmd, activate_ARG, CHANGE_AY)))
 		cmd->lockd_vg_enforce_sh = 1;
 
-	return process_each_lv(cmd, argc, argv, NULL, NULL, 0, NULL, _lvchange_activate_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, 0,
+			       NULL, &_lvchange_activate_check, &_lvchange_activate_single);
 }
 
 static int _lvchange_refresh_single(struct cmd_context *cmd,
@@ -1112,12 +1172,29 @@ static int _lvchange_refresh_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_refresh_check(struct cmd_context *cmd,
+				       struct logical_volume *lv,
+				       struct processing_handle *handle,
+				       int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			log_error("Operation not permitted (%s %d) on hidden LV %s.",
+				  cmd->command->command_line_id, cmd->command->command_line_enum,
+				  display_lvname(lv));
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_refresh_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
 	cmd->handles_missing_pvs = 1;
 	cmd->lockd_vg_default_sh = 1;
 
-	return process_each_lv(cmd, argc, argv, NULL, NULL, 0, NULL, _lvchange_refresh_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, 0,
+			       NULL, &_lvchange_refresh_check, &_lvchange_refresh_single);
 }
 
 static int _lvchange_resync_single(struct cmd_context *cmd,
@@ -1130,9 +1207,45 @@ static int _lvchange_resync_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_resync_check(struct cmd_context *cmd,
+				       struct logical_volume *lv,
+				       struct processing_handle *handle,
+				       int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			return 1;
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_resync_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
-	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE, NULL, _lvchange_resync_single);
+	int ret;
+
+	ret = process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE,
+			      NULL, &_lvchange_resync_check, &_lvchange_resync_single);
+
+	if (ret != ECMD_PROCESSED)
+		return ret;
+
+	/*
+	 * Unfortunately, lvchange has previously allowed resync and changing
+	 * activation to be combined in one command.  activate should be
+	 * done separately, but this is here to avoid breaking commands that
+	 * used this.
+	 *
+	 * FIXME: wrap this in a config setting that we can disable by default
+	 * to phase this out?
+	 */
+	if (arg_is_set(cmd, activate_ARG)) {
+		log_warn("WARNING: Combining activation change with other commands is not advised.");
+		ret = lvchange_activate_cmd(cmd, argc, argv);
+	}
+
+	return ret;
 }
 
 static int _lvchange_syncaction_single(struct cmd_context *cmd,
@@ -1145,9 +1258,24 @@ static int _lvchange_syncaction_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_syncaction_check(struct cmd_context *cmd,
+				       struct logical_volume *lv,
+				       struct processing_handle *handle,
+				       int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			return 1;
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_syncaction_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
-	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE, NULL, _lvchange_syncaction_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE,
+			       NULL, &_lvchange_syncaction_check, &_lvchange_syncaction_single);
 }
 
 static int _lvchange_rebuild_single(struct cmd_context *cmd,
@@ -1160,9 +1288,24 @@ static int _lvchange_rebuild_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_rebuild_check(struct cmd_context *cmd,
+				     struct logical_volume *lv,
+				     struct processing_handle *handle,
+				     int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			return 1;
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_rebuild_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
-	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE, NULL, _lvchange_rebuild_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE,
+			       NULL, &_lvchange_rebuild_check, &_lvchange_rebuild_single);
 }
 
 static int _lvchange_monitor_poll_single(struct cmd_context *cmd,
@@ -1180,10 +1323,25 @@ static int _lvchange_monitor_poll_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_monitor_poll_check(struct cmd_context *cmd,
+				     struct logical_volume *lv,
+				     struct processing_handle *handle,
+				     int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			return 1;
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_monitor_poll_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
 	cmd->handles_missing_pvs = 1;
-	return process_each_lv(cmd, argc, argv, NULL, NULL, 0, NULL, _lvchange_monitor_poll_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, 0,
+			       NULL, &_lvchange_monitor_poll_check, &_lvchange_monitor_poll_single);
 }
 
 static int _lvchange_persistent_single(struct cmd_context *cmd,
@@ -1196,10 +1354,27 @@ static int _lvchange_persistent_single(struct cmd_context *cmd,
 	return ECMD_PROCESSED;
 }
 
+static int _lvchange_persistent_check(struct cmd_context *cmd,
+				     struct logical_volume *lv,
+				     struct processing_handle *handle,
+				     int lv_is_named_arg)
+{
+	if (!lv_is_visible(lv)) {
+		if (lv_is_named_arg)
+			log_error("Operation not permitted (%s %d) on hidden LV %s.",
+				  cmd->command->command_line_id, cmd->command->command_line_enum,
+				  display_lvname(lv));
+		return 0;
+	}
+
+	return 1;
+}
+
 int lvchange_persistent_cmd(struct cmd_context *cmd, int argc, char **argv)
 {
 	cmd->handles_missing_pvs = 1;
-	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE, NULL, _lvchange_persistent_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE,
+			       NULL, &_lvchange_persistent_check, &_lvchange_persistent_single);
 }
 
 int lvchange(struct cmd_context *cmd, int argc, char **argv)

tools/lvdisplay.c

@@ -58,5 +58,5 @@ int lvdisplay(struct cmd_context *cmd, int argc, char **argv)
 		return EINVALID_CMD_LINE;
 	}
 
-	return process_each_lv(cmd, argc, argv, NULL, NULL, 0, NULL, &_lvdisplay_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, 0, NULL, NULL, &_lvdisplay_single);
 }

tools/lvmcmdline.c

@@ -131,32 +131,34 @@ struct command_function command_functions[COMMAND_ID_COUNT] = {
 	{ lvconvert_split_cow_snapshot_CMD, lvconvert_split_snapshot_cmd },
 	{ lvconvert_merge_snapshot_CMD, lvconvert_merge_snapshot_cmd },
 	{ lvconvert_combine_split_snapshot_CMD, lvconvert_combine_split_snapshot_cmd },
+
+	/* lvconvert utility to trigger polling on an LV. */
+	{ lvconvert_start_poll_CMD, lvconvert_start_poll_cmd },
+
+	/* lvconvert utilities for creating/maintaining thin and cache objects. */
+	{ lvconvert_to_thinpool_CMD,			lvconvert_to_pool_cmd },
+	{ lvconvert_to_thinpool_noarg_CMD,		lvconvert_to_pool_noarg_cmd },
+	{ lvconvert_to_cachepool_CMD,			lvconvert_to_pool_cmd },
+	{ lvconvert_to_cachepool_noarg_CMD,		lvconvert_to_pool_noarg_cmd },
+	{ lvconvert_to_thin_with_external_CMD,		lvconvert_to_thin_with_external_cmd },
+	{ lvconvert_to_cache_vol_CMD,			lvconvert_to_cache_vol_cmd },
 };
+
 #if 0
 	/* all raid-related type conversions */
-
 	{ lvconvert_raid_types_CMD,			lvconvert_raid_types_fn },
 
 	/* raid-related utilities (move into lvconvert_raid_types?) */
-
 	{ lvconvert_split_mirror_images_CMD,		lvconvert_split_mirror_images_fn },
 	{ lvconvert_change_mirrorlog_CMD,		lvconvert_change_mirrorlog_fn },
 
 	/* utilities for creating/maintaining thin and cache objects. */
-
-	{ lvconvert_to_thin_with_external_CMD,		lvconvert_to_thin_with_external_fn },
-	{ lvconvert_to_cache_vol_CMD,			lvconvert_to_cache_vol_fn },
-	{ lvconvert_to_thinpool_CMD,			lvconvert_to_thinpool_fn },
-	{ lvconvert_to_cachepool_CMD,			lvconvert_to_cachepool_fn },
 	{ lvconvert_split_and_keep_cachepool_CMD,	lvconvert_split_and_keep_cachepool_fn },
 	{ lvconvert_split_and_delete_cachepool_CMD,	lvconvert_split_and_delete_cachepool_fn },
 	{ lvconvert_swap_pool_metadata_CMD,		lvconvert_swap_pool_metadata_fn },
 
-	/* other misc. */
-
+	/* directed to one of the other merges (snap,thin,mirror) when all are implemented */
 	{ lvconvert_merge_CMD,				lvconvert_merge_fn },
-	{ lvconvert_poll_start_CMD,			lvconvert_poll_start_fn },
-
 #endif
 
 /* Command line args */
@@ -1126,6 +1128,18 @@ struct lv_types *get_lv_type(int lvt_enum)
 	return &_lv_types[lvt_enum];
 }
 
+struct command *get_command(int cmd_enum)
+{
+	int i;
+
+	for (i = 0; i < COMMAND_COUNT; i++) {
+		if (commands[i].command_line_enum == cmd_enum)
+			return &commands[i];
+	}
+
+	return NULL;
+}
+
 /*
  * Also see merge_synonym().  The command definitions
  * are written using just one variation of the option

tools/lvremove.c

@@ -27,5 +27,5 @@ int lvremove(struct cmd_context *cmd, int argc, char **argv)
 	cmd->include_historical_lvs = 1;
 
 	return process_each_lv(cmd, argc, argv, NULL, NULL, READ_FOR_UPDATE, NULL,
-			       &lvremove_single);
+			       NULL, &lvremove_single);
 }

tools/lvscan.c

@@ -119,5 +119,5 @@ int lvscan(struct cmd_context *cmd, int argc, char **argv)
 		 */
 	}
 
-	return process_each_lv(cmd, argc, argv, NULL, NULL, 0, NULL, &lvscan_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, 0, NULL, NULL, &lvscan_single);
 }

tools/reporter.c

@@ -517,14 +517,14 @@ static int _report_all_in_vg(struct cmd_context *cmd, struct processing_handle *
 			r = _vgs_single(cmd, vg->name, vg, handle);
 			break;
 		case LVS:
-			r = process_each_lv_in_vg(cmd, vg, NULL, NULL, 0, handle,
+			r = process_each_lv_in_vg(cmd, vg, NULL, NULL, 0, handle, NULL,
 						  do_lv_info && !do_lv_seg_status ? &_lvs_with_info_single :
 						  !do_lv_info && do_lv_seg_status ? &_lvs_with_status_single :
 						  do_lv_info && do_lv_seg_status ? &_lvs_with_info_and_status_single :
 										   &_lvs_single);
 			break;
 		case SEGS:
-			r = process_each_lv_in_vg(cmd, vg, NULL, NULL, 0, handle,
+			r = process_each_lv_in_vg(cmd, vg, NULL, NULL, 0, handle, NULL,
 						  do_lv_info && !do_lv_seg_status ? &_lvsegs_with_info_single :
 						  !do_lv_info && do_lv_seg_status ? &_lvsegs_with_status_single :
 						  do_lv_info && do_lv_seg_status ? &_lvsegs_with_info_and_status_single :
@@ -1099,7 +1099,7 @@ static int _do_report(struct cmd_context *cmd, struct processing_handle *handle,
 			if (args->full_report_vg)
 				r = _report_all_in_vg(cmd, handle, args->full_report_vg, LVS, lv_info_needed, lv_segment_status_needed);
 			else
-				r = process_each_lv(cmd, args->argc, args->argv, NULL, NULL, 0, handle,
+				r = process_each_lv(cmd, args->argc, args->argv, NULL, NULL, 0, handle, NULL,
 						    lv_info_needed && !lv_segment_status_needed ? &_lvs_with_info_single :
 						    !lv_info_needed && lv_segment_status_needed ? &_lvs_with_status_single :
 						    lv_info_needed && lv_segment_status_needed ? &_lvs_with_info_and_status_single :
@@ -1133,7 +1133,7 @@ static int _do_report(struct cmd_context *cmd, struct processing_handle *handle,
 			if (args->full_report_vg)
 				r = _report_all_in_vg(cmd, handle, args->full_report_vg, SEGS, lv_info_needed, lv_segment_status_needed);
 			else
-				r = process_each_lv(cmd, args->argc, args->argv, NULL, NULL, 0, handle,
+				r = process_each_lv(cmd, args->argc, args->argv, NULL, NULL, 0, handle, NULL,
 						    lv_info_needed && !lv_segment_status_needed ? &_lvsegs_with_info_single :
 						    !lv_info_needed && lv_segment_status_needed ? &_lvsegs_with_status_single :
 						    lv_info_needed && lv_segment_status_needed ? &_lvsegs_with_info_and_status_single :

tools/toollib.c

@@ -2529,6 +2529,10 @@ static int _lv_is_type(struct cmd_context *cmd, struct logical_volume *lv, int l
 #endif
 	case raid10_LVT:
 		return seg_is_raid10(seg);
+	case error_LVT:
+		return !strcmp(seg->segtype->name, SEG_TYPE_NAME_ERROR);
+	case zero_LVT:
+		return !strcmp(seg->segtype->name, SEG_TYPE_NAME_ZERO);
 	default:
 		log_error(INTERNAL_ERROR "unknown lv type value lvt_enum %d", lvt_enum);
 	}
@@ -2536,7 +2540,7 @@ static int _lv_is_type(struct cmd_context *cmd, struct logical_volume *lv, int l
 	return 0;
 }
 
-static int _get_lvt_enum(struct logical_volume *lv)
+int get_lvt_enum(struct logical_volume *lv)
 {
 	struct lv_segment *seg = first_seg(lv);
 
@@ -2573,7 +2577,11 @@ static int _get_lvt_enum(struct logical_volume *lv)
 	if (seg_is_raid10(seg))
 		return raid10_LVT;
 
-	log_error(INTERNAL_ERROR "unknown lv type for %s", display_lvname(lv));
+	if (!strcmp(seg->segtype->name, SEG_TYPE_NAME_ERROR))
+		return error_LVT;
+	if (!strcmp(seg->segtype->name, SEG_TYPE_NAME_ZERO))
+		return zero_LVT;
+
 	return 0;
 }
 
@@ -2669,35 +2677,29 @@ static int _lv_props_match(struct cmd_context *cmd, struct logical_volume *lv, u
 	return !found_a_mismatch;
 }
 
-/*
- * If the command definition specifies one required positional
- * LV (possibly repeatable), and specifies accepted LV types,
- * then verify that the LV being processed matches one of those
- * types.
- *
- * process_each_lv() can only be used for commands that have
- * one positional LV arg (optionally repeating, where each is
- * processed independently.)  It cannot work for commands that
- * have different required LVs in designated positions, like
- * 'lvrename LV1 LV2', where each LV is not processed
- * independently.  That means that this LV type check only
- * needs to check the lv_type of the first positional arg.
- */
-
-static int _check_lv_types(struct cmd_context *cmd, struct logical_volume *lv)
+static int _check_lv_types(struct cmd_context *cmd, struct logical_volume *lv, int pos)
 {
 	int ret = 1;
 
-	if ((cmd->command->rp_count == 1) &&
-	    val_bit_is_set(cmd->command->required_pos_args[0].def.val_bits, lv_VAL) &&
-	    cmd->command->required_pos_args[0].def.lvt_bits) {
-		ret = _lv_types_match(cmd, lv, cmd->command->required_pos_args[0].def.lvt_bits, NULL, NULL);
-		if (!ret) {
-			int lvt_enum = _get_lvt_enum(lv);
-			struct lv_types *type = get_lv_type(lvt_enum);
-			log_warn("Operation on LV %s which has invalid type %s.",
-				 display_lvname(lv), type ? type->name : "unknown");
-		}
+	if (!pos)
+		return 1;
+
+	if (!cmd->command->required_pos_args[pos-1].def.lvt_bits)
+		return 1;
+
+	if (!val_bit_is_set(cmd->command->required_pos_args[pos-1].def.val_bits, lv_VAL)) {
+		log_error(INTERNAL_ERROR "Command (%s %d) arg position %d does not permit an LV (%llx)",
+			  cmd->command->command_line_id, cmd->command->command_line_enum,
+			  pos, (unsigned long long)cmd->command->required_pos_args[pos-1].def.val_bits);
+		return 0;
+	}
+
+	ret = _lv_types_match(cmd, lv, cmd->command->required_pos_args[pos-1].def.lvt_bits, NULL, NULL);
+	if (!ret) {
+		int lvt_enum = get_lvt_enum(lv);
+		struct lv_types *type = get_lv_type(lvt_enum);
+		log_warn("Operation on LV %s which has invalid type %s.",
+			 display_lvname(lv), type ? type->name : "unknown");
 	}
 
 	return ret;
@@ -2717,7 +2719,7 @@ static int _check_lv_rules(struct cmd_context *cmd, struct logical_volume *lv)
 	int ret = 1;
 	int i;
 
-	lvt_enum = _get_lvt_enum(lv);
+	lvt_enum = get_lvt_enum(lv);
 	if (lvt_enum)
 		lvtype = get_lv_type(lvt_enum);
 
@@ -2861,10 +2863,64 @@ static int _check_lv_rules(struct cmd_context *cmd, struct logical_volume *lv)
 	return ret;
 }
 
+/*
+ * Return which arg position the given LV is at,
+ * where 1 represents the first position arg.
+ * When the first position arg is repeatable,
+ * return 1 for all.
+ *
+ * Return 0 when the command has no required
+ * position args. (optional position args are
+ * not considered.)
+ */
+
+static int _find_lv_arg_position(struct cmd_context *cmd, struct logical_volume *lv)
+{
+	const char *sep, *lvname;
+	int i;
+
+	if (cmd->command->rp_count == 0)
+		return 0;
+
+	if (cmd->command->rp_count == 1)
+		return 1;
+
+	for (i = 0; i < cmd->position_argc; i++) {
+		if (i == cmd->command->rp_count)
+			break;
+
+		if (!val_bit_is_set(cmd->command->required_pos_args[i].def.val_bits, lv_VAL))
+			continue;
+
+		if ((sep = strstr(cmd->position_argv[i], "/")))
+			lvname = sep + 1;
+		else
+			lvname = cmd->position_argv[i];
+
+		if (!strcmp(lvname, lv->name))
+			return i + 1;
+	}
+
+	/*
+	 * If the last position arg is an LV and this
+	 * arg is beyond that position, then the last
+	 * LV position arg is repeatable, so return
+	 * that position.
+	 */
+	if (i == cmd->command->rp_count) {
+		int last_pos = cmd->command->rp_count;
+		if (val_bit_is_set(cmd->command->required_pos_args[last_pos-1].def.val_bits, lv_VAL))
+			return last_pos;
+	}
+
+	return 0;
+}
+
 int process_each_lv_in_vg(struct cmd_context *cmd, struct volume_group *vg,
 			  struct dm_list *arg_lvnames, const struct dm_list *tags_in,
 			  int stop_on_error,
 			  struct processing_handle *handle,
+			  check_single_lv_fn_t check_single_lv,
 			  process_single_lv_fn_t process_single_lv)
 {
 	log_report_t saved_log_report_state = log_get_report_state();
@@ -2874,10 +2930,12 @@ int process_each_lv_in_vg(struct cmd_context *cmd, struct volume_group *vg,
 	int ret = 0;
 	int whole_selected = 0;
 	int handle_supplied = handle != NULL;
+	int lv_is_named_arg;
 	unsigned process_lv;
 	unsigned process_all = 0;
 	unsigned tags_supplied = 0;
 	unsigned lvargs_supplied = 0;
+	int lv_arg_pos;
 	struct lv_list *lvl;
 	struct dm_str_list *sl;
 	struct dm_list final_lvs;
@@ -3035,42 +3093,40 @@ int process_each_lv_in_vg(struct cmd_context *cmd, struct volume_group *vg,
 		if (lv_is_removed(lvl->lv))
 			continue;
 
+		lv_is_named_arg = str_list_match_item(&found_arg_lvnames, lvl->lv->name);
+
+		lv_arg_pos = _find_lv_arg_position(cmd, lvl->lv);
+
 		/*
 		 * The command definition may include restrictions on the
 		 * types and properties of LVs that can be processed.
 		 */
 
-		if (!_check_lv_types(cmd, lvl->lv)) {
+		if (!_check_lv_types(cmd, lvl->lv, lv_arg_pos)) {
 			/* FIXME: include this result in report log? */
-			/* FIXME: avoid duplicating message for each level */
-
-			if (str_list_match_item(&found_arg_lvnames, lvl->lv->name)) {
+			if (lv_is_named_arg) {
 				log_error("Operation not permitted (%s %d) on LV %s.",
 					  cmd->command->command_line_id, cmd->command->command_line_enum,
 					  display_lvname(lvl->lv));
 				ret_max = ECMD_FAILED;
-			} else {
-				log_warn("Operation not permitted (%s %d) on LV %s.",
-					 cmd->command->command_line_id, cmd->command->command_line_enum,
-					 display_lvname(lvl->lv));
 			}
 			continue;
 		}
 
 		if (!_check_lv_rules(cmd, lvl->lv)) {
 			/* FIXME: include this result in report log? */
-			/* FIXME: avoid duplicating message for each level */
-
-			if (str_list_match_item(&found_arg_lvnames, lvl->lv->name)) {
+			if (lv_is_named_arg) {
 				log_error("Operation not permitted (%s %d) on LV %s.",
 					  cmd->command->command_line_id, cmd->command->command_line_enum,
 					  display_lvname(lvl->lv));
 				ret_max = ECMD_FAILED;
-			} else {
-				log_warn("Operation not permitted (%s %d) on LV %s.",
-					 cmd->command->command_line_id, cmd->command->command_line_enum,
-					 display_lvname(lvl->lv));
-			}
+			} 
+			continue;
+		}
+
+		if (check_single_lv && !check_single_lv(cmd, lvl->lv, handle, lv_is_named_arg)) {
+			if (lv_is_named_arg)
+				ret_max = ECMD_FAILED;
 			continue;
 		}
 
@@ -3310,6 +3366,7 @@ static int _process_lv_vgnameid_list(struct cmd_context *cmd, uint32_t read_flag
 				     struct dm_list *arg_lvnames,
 				     struct dm_list *arg_tags,
 				     struct processing_handle *handle,
+				     check_single_lv_fn_t check_single_lv,
 				     process_single_lv_fn_t process_single_lv)
 {
 	log_report_t saved_log_report_state = log_get_report_state();
@@ -3402,7 +3459,7 @@ static int _process_lv_vgnameid_list(struct cmd_context *cmd, uint32_t read_flag
 			goto endvg;
 
 		ret = process_each_lv_in_vg(cmd, vg, &lvnames, tags_arg, 0,
-					    handle, process_single_lv);
+					    handle, check_single_lv, process_single_lv);
 		if (ret != ECMD_PROCESSED)
 			stack;
 		report_log_ret_code(ret);
@@ -3433,6 +3490,7 @@ int process_each_lv(struct cmd_context *cmd,
 		    const char *one_vgname, const char *one_lvname,
 		    uint32_t read_flags,
 		    struct processing_handle *handle,
+		    check_single_lv_fn_t check_single_lv,
 		    process_single_lv_fn_t process_single_lv)
 {
 	log_report_t saved_log_report_state = log_get_report_state();
@@ -3548,7 +3606,7 @@ int process_each_lv(struct cmd_context *cmd,
 		_choose_vgs_to_process(cmd, &arg_vgnames, &vgnameids_on_system, &vgnameids_to_process);
 
 	ret = _process_lv_vgnameid_list(cmd, read_flags, &vgnameids_to_process, &arg_vgnames, &arg_lvnames,
-					&arg_tags, handle, process_single_lv);
+					&arg_tags, handle, check_single_lv, process_single_lv);
 
 	if (ret > ret_max)
 		ret_max = ret;

tools/toollib.h

@@ -98,6 +98,18 @@ typedef int (*process_single_pvseg_fn_t) (struct cmd_context * cmd,
 					  struct pv_segment * pvseg,
 					  struct processing_handle *handle);
 
+/*
+ * Called prior to process_single_lv() to decide if the LV should be
+ * processed.  If this returns 0, the LV is not processed.
+ *
+ * This can evaluate the combination of command definition and
+ * the LV object to decide if the combination is allowed.
+ */
+typedef int (*check_single_lv_fn_t) (struct cmd_context *cmd,
+				     struct logical_volume *lv,
+				     struct processing_handle *handle,
+				     int lv_is_named_arg);
+
 int process_each_vg(struct cmd_context *cmd,
 	            int argc, char **argv,
 		    const char *one_vgname,
@@ -125,6 +137,7 @@ int process_each_segment_in_pv(struct cmd_context *cmd,
 int process_each_lv(struct cmd_context *cmd, int argc, char **argv,
 		    const char *one_vgname, const char *one_lvname,
 		    uint32_t flags, struct processing_handle *handle,
+		    check_single_lv_fn_t check_single_lv,
 		    process_single_lv_fn_t process_single_lv);
 
 
@@ -141,6 +154,7 @@ int process_each_pv_in_vg(struct cmd_context *cmd, struct volume_group *vg,
 int process_each_lv_in_vg(struct cmd_context *cmd, struct volume_group *vg,
 			  struct dm_list *arg_lvnames, const struct dm_list *tagsl,
 			  int stop_on_error, struct processing_handle *handle,
+			  check_single_lv_fn_t check_single_lv,
 			  process_single_lv_fn_t process_single_lv);
 
 struct processing_handle *init_processing_handle(struct cmd_context *cmd, struct processing_handle *parent_handle);
@@ -226,4 +240,6 @@ int validate_restricted_lvname_param(struct cmd_context *cmd, const char **vg_na
 int lvremove_single(struct cmd_context *cmd, struct logical_volume *lv,
                     struct processing_handle *handle __attribute__((unused)));
 
+int get_lvt_enum(struct logical_volume *lv);
+
 #endif

tools/tools.h

@@ -240,6 +240,7 @@ int vgchange_background_polling(struct cmd_context *cmd, struct volume_group *vg
 
 struct lv_props *get_lv_prop(int lvp_enum);
 struct lv_types *get_lv_type(int lvt_enum);
+struct command *get_command(int cmd_enum);
 
 int lvchange_properties_cmd(struct cmd_context *cmd, int argc, char **argv);
 int lvchange_activate_cmd(struct cmd_context *cmd, int argc, char **argv);
@@ -257,4 +258,11 @@ int lvconvert_merge_snapshot_cmd(struct cmd_context *cmd, int argc, char **argv)
 int lvconvert_split_snapshot_cmd(struct cmd_context *cmd, int argc, char **argv);
 int lvconvert_combine_split_snapshot_cmd(struct cmd_context *cmd, int argc, char **argv);
 
+int lvconvert_start_poll_cmd(struct cmd_context *cmd, int argc, char **argv);
+
+int lvconvert_to_pool_cmd(struct cmd_context *cmd, int argc, char **argv);
+int lvconvert_to_pool_noarg_cmd(struct cmd_context *cmd, int argc, char **argv);
+int lvconvert_to_cache_vol_cmd(struct cmd_context *cmd, int argc, char **argv);
+int lvconvert_to_thin_with_external_cmd(struct cmd_context *cmd, int argc, char **argv);
+
 #endif

tools/vgdisplay.c

@@ -38,7 +38,7 @@ static int vgdisplay_single(struct cmd_context *cmd, const char *vg_name,
 		vgdisplay_extents(vg);
 
 		process_each_lv_in_vg(cmd, vg, NULL, NULL, 0, NULL,
-				      (process_single_lv_fn_t)lvdisplay_full);
+				      NULL, (process_single_lv_fn_t)lvdisplay_full);
 
 		log_print("--- Physical volumes ---");
 		process_each_pv_in_vg(cmd, vg, NULL,

tools/vgmknodes.c

@@ -33,5 +33,5 @@ int vgmknodes(struct cmd_context *cmd, int argc, char **argv)
 	if (!lv_mknodes(cmd, NULL))
 		return_ECMD_FAILED;
 
-	return process_each_lv(cmd, argc, argv, NULL, NULL, LCK_VG_READ, NULL, &_vgmknodes_single);
+	return process_each_lv(cmd, argc, argv, NULL, NULL, LCK_VG_READ, NULL, NULL, &_vgmknodes_single);
 }

tools/vgremove.c

@@ -62,7 +62,7 @@ static int vgremove_single(struct cmd_context *cmd, const char *vg_name,
 		}
 
 		if ((ret = process_each_lv_in_vg(cmd, vg, NULL, NULL, 1, &void_handle,
-						 (process_single_lv_fn_t)lvremove_single)) != ECMD_PROCESSED) {
+						 NULL, (process_single_lv_fn_t)lvremove_single)) != ECMD_PROCESSED) {
 			stack;
 			return ret;
 		}