xfs: remove xarray mark for reclaimable zones

We can easily check if there are any reclaimble zones by just looking
at the used counters in the reclaim buckets, so do that to free up the
xarray mark we currently use for this purpose.

Signed-off-by: Hans Holmberg <hans.holmberg@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

Author: yhr

fs/xfs/libxfs/xfs_rtgroup.h

@@ -64,12 +64,6 @@ struct xfs_rtgroup {
  */
 #define XFS_RTG_FREE			XA_MARK_0
 
-/*
- * For zoned RT devices this is set on groups that are fully written and that
- * have unused blocks.  Used by the garbage collection to pick targets.
- */
-#define XFS_RTG_RECLAIMABLE		XA_MARK_1
-
 static inline struct xfs_rtgroup *to_rtg(struct xfs_group *xg)
 {
 	return container_of(xg, struct xfs_rtgroup, rtg_group);

fs/xfs/xfs_zone_alloc.c

@@ -103,9 +103,6 @@ xfs_zone_account_reclaimable(
 		 */
 		trace_xfs_zone_emptied(rtg);
 
-		if (!was_full)
-			xfs_group_clear_mark(xg, XFS_RTG_RECLAIMABLE);
-
 		spin_lock(&zi->zi_used_buckets_lock);
 		if (!was_full)
 			xfs_zone_remove_from_bucket(zi, rgno, from_bucket);
@@ -127,7 +124,6 @@ xfs_zone_account_reclaimable(
 		xfs_zone_add_to_bucket(zi, rgno, to_bucket);
 		spin_unlock(&zi->zi_used_buckets_lock);
 
-		xfs_group_set_mark(xg, XFS_RTG_RECLAIMABLE);
 		if (zi->zi_gc_thread && xfs_zoned_need_gc(mp))
 			wake_up_process(zi->zi_gc_thread);
 	} else if (to_bucket != from_bucket) {
@@ -142,6 +138,28 @@ xfs_zone_account_reclaimable(
 	}
 }
 
+/*
+ * Check if we have any zones that can be reclaimed by looking at the entry
+ * counters for the zone buckets.
+ */
+bool
+xfs_zoned_have_reclaimable(
+	struct xfs_zone_info	*zi)
+{
+	int i;
+
+	spin_lock(&zi->zi_used_buckets_lock);
+	for (i = 0; i < XFS_ZONE_USED_BUCKETS; i++) {
+		if (zi->zi_used_bucket_entries[i]) {
+			spin_unlock(&zi->zi_used_buckets_lock);
+			return true;
+		}
+	}
+	spin_unlock(&zi->zi_used_buckets_lock);
+
+	return false;
+}
+
 static void
 xfs_open_zone_mark_full(
 	struct xfs_open_zone	*oz)

fs/xfs/xfs_zone_gc.c

@@ -175,7 +175,7 @@ xfs_zoned_need_gc(
 	s64			available, free, threshold;
 	s32			remainder;
 
-	if (!xfs_group_marked(mp, XG_TYPE_RTG, XFS_RTG_RECLAIMABLE))
+	if (!xfs_zoned_have_reclaimable(mp->m_zone_info))
 		return false;
 
 	available = xfs_estimate_freecounter(mp, XC_FREE_RTAVAILABLE);

fs/xfs/xfs_zone_priv.h

@@ -113,6 +113,7 @@ struct xfs_open_zone *xfs_open_zone(struct xfs_mount *mp,
 
 int xfs_zone_gc_reset_sync(struct xfs_rtgroup *rtg);
 bool xfs_zoned_need_gc(struct xfs_mount *mp);
+bool xfs_zoned_have_reclaimable(struct xfs_zone_info *zi);
 int xfs_zone_gc_mount(struct xfs_mount *mp);
 void xfs_zone_gc_unmount(struct xfs_mount *mp);
 

fs/xfs/xfs_zone_space_resv.c

@@ -172,7 +172,7 @@ xfs_zoned_reserve_available(
 		 * processing a pending GC request give up as we're fully out
 		 * of space.
 		 */
-		if (!xfs_group_marked(mp, XG_TYPE_RTG, XFS_RTG_RECLAIMABLE) &&
+		if (!xfs_zoned_have_reclaimable(mp->m_zone_info) &&
 		    !xfs_is_zonegc_running(mp))
 			break;