main - lvremove: fix removing thin pool with writecache on data

[David Teigland]

Gitweb:       
https://sourceware.org/git/?p=lvm2.git;a=commitdiff;h=4a746f7ffcc8e61c9cb...
Commit:        4a746f7ffcc8e61c9cb5ce9f9e8a061d1ef6b28e
Parent:        a65f8e0a62b9ab3c2fc909a63abfa0e933619a8c
Author:        David Teigland <teigland(a)redhat.com&gt;
AuthorDate:    Mon May 24 16:08:27 2021 -0500
Committer:     David Teigland <teigland(a)redhat.com&gt;
CommitterDate: Mon May 24 16:09:35 2021 -0500

lvremove: fix removing thin pool with writecache on data

---
 lib/metadata/lv_manip.c                | 19 +++++++++
 lib/metadata/metadata-exported.h       |  2 +
 lib/metadata/thin_manip.c              | 12 ++++++
 test/shell/lvremove-thindata-caches.sh | 71 ++++++++++++++++++++++++++++++++++
 4 files changed, 104 insertions(+)

diff --git a/lib/metadata/lv_manip.c b/lib/metadata/lv_manip.c
index 508f78c13..37dd3611d 100644
--- a/lib/metadata/lv_manip.c
+++ b/lib/metadata/lv_manip.c
@@ -6692,6 +6692,25 @@ int lv_remove_single(struct cmd_context *cmd, struct logical_volume
*lv,
 			return_0;
 	}
 
+	/* if thin pool data lv is writecache, then detach and remove the writecache */
+	if (lv_is_thin_pool(lv)) {
+		struct logical_volume *data_lv = data_lv_from_thin_pool(lv);
+
+		if (data_lv && lv_is_writecache(data_lv)) {
+			struct logical_volume *cachevol_lv = first_seg(data_lv)->writecache;
+
+			if (!lv_detach_writecache_cachevol(data_lv, 1)) {
+				log_error("Failed to detach writecache from %s", display_lvname(data_lv));
+				return 0;
+			}
+
+			if (!lv_remove_single(cmd, cachevol_lv, force, 1)) {
+				log_error("Failed to remove cachevol %s.", display_lvname(cachevol_lv));
+				return 0;
+			}
+		}
+	}
+
 	if (lv_is_writecache(lv)) {
 		struct logical_volume *cachevol_lv = first_seg(lv)->writecache;
 
diff --git a/lib/metadata/metadata-exported.h b/lib/metadata/metadata-exported.h
index 52062a100..9ac3c677e 100644
--- a/lib/metadata/metadata-exported.h
+++ b/lib/metadata/metadata-exported.h
@@ -928,6 +928,8 @@ int handle_pool_metadata_spare(struct volume_group *vg, uint32_t
extents,
 int vg_set_pool_metadata_spare(struct logical_volume *lv);
 int vg_remove_pool_metadata_spare(struct volume_group *vg);
 
+struct logical_volume *data_lv_from_thin_pool(struct logical_volume *pool_lv);
+
 int attach_thin_external_origin(struct lv_segment *seg,
 				struct logical_volume *external_lv);
 int detach_thin_external_origin(struct lv_segment *seg);
diff --git a/lib/metadata/thin_manip.c b/lib/metadata/thin_manip.c
index 451c38260..6ce88bd3d 100644
--- a/lib/metadata/thin_manip.c
+++ b/lib/metadata/thin_manip.c
@@ -21,6 +21,18 @@
 #include "lib/config/defaults.h"
 #include "lib/display/display.h"
 
+struct logical_volume *data_lv_from_thin_pool(struct logical_volume *pool_lv)
+{
+	struct lv_segment *seg_thinpool = first_seg(pool_lv);
+
+	if (!seg_thinpool || !seg_is_thin_pool(seg_thinpool)) {
+		log_error(INTERNAL_ERROR "data_lv_from_thin_pool arg not thin pool %s",
pool_lv->name);
+		return NULL;
+	}
+
+	return seg_thinpool->areas[0].u.lv.lv;
+}
+
 /* TODO: drop unused no_update */
 int attach_pool_message(struct lv_segment *pool_seg, dm_thin_message_t type,
 			struct logical_volume *lv, uint32_t delete_id,
diff --git a/test/shell/lvremove-thindata-caches.sh
b/test/shell/lvremove-thindata-caches.sh
new file mode 100644
index 000000000..ba099c373
--- /dev/null
+++ b/test/shell/lvremove-thindata-caches.sh
@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+
+# Copyright (C) 2017-2020 Red Hat, Inc. All rights reserved.
+#
+# 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 General Public License v.2.
+#
+# You should have received a copy of the GNU 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
+
+SKIP_WITH_LVMPOLLD=1
+
+. lib/inittest
+
+aux have_cache 1 10 0 || skip
+aux have_writecache 1 0 0 || skip
+which mkfs.xfs || skip
+
+aux prepare_devs 6 70 # want 64M of usable space from each dev
+
+vgcreate $SHARED $vg "$dev1" "$dev2" "$dev3"
"$dev4" "$dev5" "$dev6"
+
+# lv1 is thinpool LV: 128M
+# lv2 is fast LV:      64M
+# lv3 is thin LV:       1G
+
+#
+# Test lvremove of a thinpool that uses cache|writecache on data
+#
+
+# attach writecache to thinpool data
+lvcreate --type thin-pool -n $lv1 -L128M --poolmetadataspare n $vg "$dev1"
"$dev2"
+lvcreate --type thin -n $lv3 -V1G --thinpool $lv1 $vg
+lvcreate -n $lv2 -L64M -an $vg "$dev3"
+lvconvert -y --type writecache --cachevol $lv2 $vg/$lv1
+lvchange -ay $vg/$lv1
+lvs -a $vg
+mkfs.xfs -f -s size=4096 "$DM_DEV_DIR/$vg/$lv3"
+lvremove -y $vg/$lv1
+
+# attach cache/writeback (cachevol) to thinpool data
+lvcreate --type thin-pool -n $lv1 -L128M --poolmetadataspare n $vg "$dev1"
"$dev2"
+lvcreate --type thin -n $lv3 -V1G --thinpool $lv1 $vg
+lvcreate -n $lv2 -L64M -an $vg "$dev3"
+lvconvert -y --type cache --cachevol $lv2 --cachemode writeback $vg/$lv1
+lvchange -ay $vg/$lv1
+mkfs.xfs -f -s size=4096 "$DM_DEV_DIR/$vg/$lv3"
+lvremove -y $vg/$lv1
+
+# attach cache/writethrough (cachevol) to thinpool data
+lvcreate --type thin-pool -n $lv1 -L128M --poolmetadataspare n $vg "$dev1"
"$dev2"
+lvcreate --type thin -n $lv3 -V1G --thinpool $lv1 $vg
+lvcreate -n $lv2 -L64M -an $vg "$dev3"
+lvconvert -y --type cache --cachevol $lv2 --cachemode writethrough $vg/$lv1
+lvchange -ay $vg/$lv1
+mkfs.xfs -f -s size=4096 "$DM_DEV_DIR/$vg/$lv3"
+lvremove -y $vg/$lv1
+
+# attach cache (cachepool) to thinpool data
+lvcreate --type thin-pool -n $lv1 -L128M --poolmetadataspare n $vg "$dev1"
"$dev2"
+lvcreate --type thin -n $lv3 -V1G --thinpool $lv1 $vg
+lvcreate -y --type cache-pool -n $lv2 -L64M --poolmetadataspare n $vg "$dev3"
"$dev6"
+lvconvert -y --type cache --cachepool $lv2 --poolmetadataspare n $vg/$lv1
+lvchange -ay $vg/$lv1
+mkfs.xfs -f -s size=4096 "$DM_DEV_DIR/$vg/$lv3"
+lvremove -y $vg/$lv1
+
+vgremove -f $vg
+