[lvm-devel] [PATCH 2 of 5] LVM: New function - lv_is_on_pv

[Jonathan Brassow]

lv_is_on_pv - A useful function when devices are specified for removal from RAID

This function should also be useful for mirror down-converting.

Signed-off-by: Jonathan Brassow <jbrassow at redhat.com>

Index: LVM2/lib/metadata/lv_manip.c
===================================================================
--- LVM2.orig/lib/metadata/lv_manip.c
+++ LVM2/lib/metadata/lv_manip.c
@@ -3513,6 +3513,61 @@ static int _match_seg_area_to_pe_range(s
 }
 
 /*
+ * pv_is_in_lv
+ * @lv:
+ * @pv:
+ *
+ * If any of the component devices of the LV are on the given PV, 1
+ * is returned; otherwise 0.  For example if one of the images of a mirror
+ * (or its log) is on the PV, 1 would be returned for the top-level LV.
+ * If you wish to check the images themselves, you should pass them.
+ */
+int pv_is_in_lv(struct logical_volume *lv, struct physical_volume *pv)
+{
+	uint32_t s;
+	struct physical_volume *pv2;
+	struct lv_segment *seg;
+
+	if (!lv)
+		return 0;
+
+	seg = first_seg(lv);
+	if (!seg)
+		return 0;
+
+	/* Check mirror log */
+	if (pv_is_in_lv(seg->log_lv, pv))
+		return 1;
+
+	/* Check stack of LVs */
+	dm_list_iterate_items(seg, &lv->segments) {
+		for (s = 0; s < seg->area_count; s++) {
+			if (seg_type(seg, s) == AREA_PV) {
+				pv2 = seg_pv(seg, s);
+				if (id_equal(&pv->id, &pv2->id))
+					return 1;
+				if (pv->dev && pv2->dev &&
+				    (pv->dev->dev == pv2->dev->dev))
+					return 1;
+			}
+
+			if ((seg_type(seg, s) == AREA_LV) &&
+			    pv_is_in_lv(seg_lv(seg, s), pv))
+				return 1;
+
+			if (!seg_is_raid(seg))
+				continue;
+
+			/* This is RAID, so we know the meta_area is AREA_LV */
+			if (pv_is_in_lv(seg_metalv(seg, s), pv))
+				return 1;
+		}
+	}
+
+	return 0;
+}
+
+/*
  * For each segment in lv_where that uses a PV in pvl directly,
  * split the segment if it spans more than one underlying PV.
  */
Index: LVM2/lib/metadata/metadata-exported.h
===================================================================
--- LVM2.orig/lib/metadata/metadata-exported.h
+++ LVM2/lib/metadata/metadata-exported.h
@@ -645,6 +645,7 @@ int lv_is_merging_cow(const struct logic
 int lv_is_visible(const struct logical_volume *lv);
 
 int pv_is_in_vg(struct volume_group *vg, struct physical_volume *pv);
+int pv_is_in_lv(struct logical_volume *lv, struct physical_volume *pv);
 
 struct lv_segment *find_merging_cow(const struct logical_volume *origin);