display: add display_lvname

Add simple function to print vg/lv name.
Useful i.e. in error messages.

2 files changed, 11 insertions, 0 deletions

diff --git a/lib/display/display.c b/lib/display/display.c
index 9780f10a8..fd785ed90 100644
--- a/lib/display/display.c
+++ b/lib/display/display.c
@@ -93,6 +93,15 @@ const char *get_percent_string(percent_type_t def)
 	return _percent_types[def];
 }
 
+const char *display_lvname(const struct logical_volume *lv)
+{
+	char buf[NAME_LEN * 2 + 2];
+
+	(void) snprintf(buf, sizeof(buf), "%s/%s", lv->vg->name, lv->name);
+
+	return dm_pool_strdup(lv->vg->cmd->mem, buf) ? : lv->name; /* at least LV name... */
+}
+
 #define BASE_UNKNOWN 0
 #define BASE_SHARED 1
 #define BASE_1024 8
diff --git a/lib/display/display.h b/lib/display/display.h
index d5c0efa2e..cc5654b61 100644
--- a/lib/display/display.h
+++ b/lib/display/display.h
@@ -22,6 +22,8 @@
 
 #include <stdint.h>
 
+const char *display_lvname(const struct logical_volume *lv);
+
 /* Specify size in KB */
 const char *display_size(const struct cmd_context *cmd, uint64_t size);
 const char *display_size_long(const struct cmd_context *cmd, uint64_t size);