[PATCH 16/20] btrfs: factor out found_extent()

[Naohiro Aota <naohiro.aota@xxxxxxx>]

Factor out found_extent() from find_free_extent_update_loop(). This
function is called when a proper extent is found and before returning from
find_free_extent().  Hook functions like found_extent_clustered() should
save information for a next allocation.

Signed-off-by: Naohiro Aota <naohiro.aota@xxxxxxx>
---
 fs/btrfs/extent-tree.c | 32 +++++++++++++++++++++++++++-----
 1 file changed, 27 insertions(+), 5 deletions(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 9f01c2bf7e11..d70ef18de832 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -3737,6 +3737,32 @@ static void release_block_group(struct btrfs_block_group *block_group,
 	btrfs_release_block_group(block_group, delalloc);
 }
 
+static void found_extent_clustered(struct find_free_extent_ctl *ffe_ctl,
+				   struct btrfs_key *ins)
+{
+	struct clustered_alloc_info *clustered = ffe_ctl->alloc_info;
+	struct btrfs_free_cluster *last_ptr = clustered->last_ptr;
+	bool use_cluster = clustered->use_cluster;
+
+	if (!use_cluster && last_ptr) {
+		spin_lock(&last_ptr->lock);
+		last_ptr->window_start = ins->objectid;
+		spin_unlock(&last_ptr->lock);
+	}
+}
+
+static void found_extent(struct find_free_extent_ctl *ffe_ctl,
+			 struct btrfs_key *ins)
+{
+	switch (ffe_ctl->policy) {
+	case BTRFS_EXTENT_ALLOC_CLUSTERED:
+		found_extent_clustered(ffe_ctl, ins);
+		break;
+	default:
+		BUG();
+	}
+}
+
 /*
  * Return >0 means caller needs to re-search for free extent
  * Return 0 means we have the needed free extent.
@@ -3764,11 +3790,7 @@ static int find_free_extent_update_loop(struct btrfs_fs_info *fs_info,
 		return 1;
 
 	if (ins->objectid) {
-		if (!use_cluster && last_ptr) {
-			spin_lock(&last_ptr->lock);
-			last_ptr->window_start = ins->objectid;
-			spin_unlock(&last_ptr->lock);
-		}
+		found_extent(ffe_ctl, ins);
 		return 0;
 	}
 
-- 
2.25.0