cleanup: ignore vg_name in /lib

Since  vg_name inside /lib function has already been ignored mostly
except for a few debug prints - make it and official internal API
feature.

vg_name is used only in  /tools while the VG is not yet openned,
and when  lvresize/lvcreate /lib function is called with VG pointer
already being used, then vg_name becomes irrelevant (it's not been
validated anyway).

So any internal user of lvcreate_params and lvresize_params does not
need to set vg_name pointer and may leave it NULL.

lib/metadata/lv_manip.c

@@ -3658,8 +3658,8 @@ static int _fsadm_cmd(struct cmd_context *cmd,
 	if (status)
 		*status = -1;
 
-	if (dm_snprintf(lv_path, PATH_MAX, "%s%s/%s", cmd->dev_dir, lp->vg_name,
+	if (dm_snprintf(lv_path, sizeof(lv_path), "%s%s/%s", cmd->dev_dir,
-			lp->lv_name) < 0) {
+			vg->name, lp->lv_name) < 0) {
 		log_error("Couldn't create LV path for %s", lp->lv_name);
 		return 0;
 	}
@@ -3667,7 +3667,7 @@ static int _fsadm_cmd(struct cmd_context *cmd,
 	argv[i++] = lv_path;
 
 	if (fcmd == FSADM_CMD_RESIZE) {
-		if (dm_snprintf(size_buf, SIZE_BUF, "%" PRIu64 "K",
+		if (dm_snprintf(size_buf, sizeof(size_buf), "%" PRIu64 "K",
 				(uint64_t) lp->extents * (vg->extent_size / 2)) < 0) {
 			log_error("Couldn't generate new LV size string");
 			return 0;
@@ -3713,7 +3713,7 @@ static int _adjust_policy_params(struct cmd_context *cmd,
 		    (percent > policy_threshold)) {
 			if (!thin_pool_feature_supported(lv, THIN_FEATURE_METADATA_RESIZE)) {
 				log_error_once("Online metadata resize for %s/%s is not supported.",
-					       lp->vg_name, lp->lv_name);
+					       lv->vg->name, lv->name);
 				return 0;
 			}
 			lp->poolmetadatasize = (first_seg(lv)->metadata_lv->size *
@@ -6015,7 +6015,7 @@ static struct logical_volume *_lv_create_an_lv(struct volume_group *vg,
 
 	if (new_lv_name && find_lv_in_vg(vg, new_lv_name)) {
 		log_error("Logical volume \"%s\" already exists in "
-			  "volume group \"%s\"", new_lv_name, lp->vg_name);
+			  "volume group \"%s\"", new_lv_name, vg->name);
 		return NULL;
 	}
 

lib/metadata/metadata-exported.h

@@ -473,7 +473,7 @@ struct pvcreate_params {
 };
 
 struct lvresize_params {
-	const char *vg_name;
+	const char *vg_name; /* only-used when VG is not yet opened (in /tools) */
 	const char *lv_name;
 
 	uint32_t stripes;
@@ -782,7 +782,7 @@ struct lvcreate_params {
 
 	const char *origin; /* snap */
 	const char *pool;   /* thin */
-	const char *vg_name; /* all */
+	const char *vg_name; /* only-used when VG is not yet opened (in /tools) */
 	const char *lv_name; /* all */
 
 	/* Keep args given by the user on command line */

lib/metadata/thin_manip.c

@@ -559,7 +559,6 @@ struct logical_volume *alloc_pool_metadata(struct logical_volume *pool_lv,
 		.read_ahead = read_ahead,
 		.stripe_size = stripe_size,
 		.stripes = stripes,
-		.vg_name = pool_lv->vg->name,
 		.zero = 1,
 	};
 
@@ -600,7 +599,6 @@ static struct logical_volume *_alloc_pool_metadata_spare(struct volume_group *vg
 		.pvh = pvh ? : &vg->pvs,
 		.read_ahead = DM_READ_AHEAD_AUTO,
 		.stripes = 1,
-		.vg_name = vg->name,
 		.zero = 1,
 		.temporary = 1,
 	};

liblvm/lvm_lv.c

@@ -194,7 +194,6 @@ static void _lv_set_default_params(struct lvcreate_params *lp,
 	lp->major = -1;
 	lp->minor = -1;
 	lp->activate = CHANGE_AY;
-	lp->vg_name = vg->name;
 	lp->lv_name = lvname; /* FIXME: check this for safety */
 	lp->pvh = &vg->pvs;
 
@@ -458,19 +457,16 @@ int lvm_lv_rename(lv_t lv, const char *new_name)
 int lvm_lv_resize(const lv_t lv, uint64_t new_size)
 {
 	int rc = 0;
-	struct lvresize_params lp = { 0 };
+	struct lvresize_params lp = {
-	struct saved_env e = { 0 };
+		.lv_name = lv->name,
-
+		.sign = SIGN_NONE,
-	lp.vg_name = lv->vg->name;
+		.percent = PERCENT_NONE,
-	lp.lv_name = lv->name;
+		.resize = LV_ANY,
-	lp.sign = SIGN_NONE;
+		.size = new_size >> SECTOR_SHIFT,
-	lp.percent = PERCENT_NONE;
+		.ac_force = 1,	/* Assume the user has a good backup? */
-	lp.resize = LV_ANY;
+		.sizeargs = 1,
-	lp.size = new_size >> SECTOR_SHIFT;
+	};
-	lp.ac_force = 1;	/* Assume the user has a good backup? */
+	struct saved_env e = store_user_env(lv->vg->cmd);
-	lp.sizeargs = 1;
-
-	e = store_user_env(lv->vg->cmd);
 
 	if (!lv_resize_prepare(lv->vg->cmd, lv, &lp, &lv->vg->pvs) ||
 	    !lv_resize(lv->vg->cmd, lv, &lp, &lv->vg->pvs)) {

tools/lvconvert.c

@@ -2522,7 +2522,6 @@ static int _lvconvert_thinpool_external(struct cmd_context *cmd,
 		.pvh = &vg->pvs,
 		.read_ahead = DM_READ_AHEAD_AUTO,
 		.stripes = 1,
-		.vg_name = vg->name,
 		.voriginextents = external_lv->le_count,
 		.voriginsize = external_lv->size,
 	};