Revert "Evict meta data from ghost lists + l2arc headers"

This reverts commit fadd0c4 which
introduced a regression in honoring the meta limit.

Signed-off-by: Brian Behlendorf <[email protected]>
Close #1660

Author: behlendorf

module/zfs/arc.c

@@ -2104,9 +2104,8 @@ arc_do_user_evicts(void)
 void
 arc_adjust_meta(int64_t adjustment, boolean_t may_prune)
 {
-	int64_t delta, tmp = adjustment;
+	int64_t delta;
 
-	/* Evict MRU+MFU meta data to ghost lists */
 	if (adjustment > 0 && arc_mru->arcs_lsize[ARC_BUFC_METADATA] > 0) {
 		delta = MIN(arc_mru->arcs_lsize[ARC_BUFC_METADATA], adjustment);
 		arc_evict(arc_mru, 0, delta, FALSE, ARC_BUFC_METADATA);
@@ -2116,24 +2115,9 @@ arc_adjust_meta(int64_t adjustment, boolean_t may_prune)
 	if (adjustment > 0 && arc_mfu->arcs_lsize[ARC_BUFC_METADATA] > 0) {
 		delta = MIN(arc_mfu->arcs_lsize[ARC_BUFC_METADATA], adjustment);
 		arc_evict(arc_mfu, 0, delta, FALSE, ARC_BUFC_METADATA);
-	}
-
-	/* Evict ghost MRU+MFU meta data */
-	adjustment = tmp;
-
-	if (adjustment > 0 && arc_mru_ghost->arcs_size > 0) {
-		delta = MIN(arc_mru_ghost->arcs_size, adjustment);
-		arc_evict_ghost(arc_mru_ghost, 0, delta, ARC_BUFC_METADATA);
-		adjustment -= delta;
-	}
-
-	if (adjustment > 0 && arc_mfu_ghost->arcs_size > 0) {
-		delta = MIN(arc_mfu_ghost->arcs_size, adjustment);
-		arc_evict_ghost(arc_mfu_ghost, 0, delta, ARC_BUFC_METADATA);
 		adjustment -= delta;
 	}
 
-	/* Request the VFS release some meta data */
 	if (may_prune && (adjustment > 0) && (arc_meta_used > arc_meta_limit))
 		arc_do_user_prune(zfs_arc_meta_prune);
 }