Btrfs: Btree defrag on the extent-mapping tree as well

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 11 insertions, 7 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index c7e47e77723..ee1ae00d282 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -99,7 +99,6 @@ static int __btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root
                 if (ret)
                         return ret;
         } else {
-                WARN_ON(!root->ref_cows);
                 clean_tree_block(trans, root, buf);
         }
 
@@ -162,13 +161,14 @@ static int close_blocks(u64 blocknr, u64 other)
 
 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
                        struct btrfs_root *root, struct buffer_head *parent,
-                       int cache_only)
+                       int cache_only, u64 *last_ret)
 {
         struct btrfs_node *parent_node;
         struct buffer_head *cur_bh;
         struct buffer_head *tmp_bh;
         u64 blocknr;
-        u64 search_start = 0;
+        u64 search_start = *last_ret;
+        u64 last_block = 0;
         u64 other;
         u32 parent_nritems;
         int start_slot;
@@ -198,6 +198,8 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
         for (i = start_slot; i < end_slot; i++) {
                 int close = 1;
                 blocknr = btrfs_node_blockptr(parent_node, i);
+                if (last_block == 0)
+                        last_block = blocknr;
                 if (i > 0) {
                         other = btrfs_node_blockptr(parent_node, i - 1);
                         close = close_blocks(blocknr, other);
@@ -206,8 +208,10 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
                         other = btrfs_node_blockptr(parent_node, i + 1);
                         close = close_blocks(blocknr, other);
                 }
-                if (close)
+                if (close) {
+                        last_block = blocknr;
                         continue;
+                }
 
                 cur_bh = btrfs_find_tree_block(root, blocknr);
                 if (!cur_bh || !buffer_uptodate(cur_bh) ||
@@ -219,9 +223,9 @@ int btrfs_realloc_node(struct btrfs_trans_handle *trans,
                         brelse(cur_bh);
                         cur_bh = read_tree_block(root, blocknr);
                 }
-                if (search_start == 0) {
-                        search_start = bh_blocknr(cur_bh) & ~((u64)65535);
-                }
+                if (search_start == 0)
+                        search_start = last_block & ~((u64)65535);
+
                 err = __btrfs_cow_block(trans, root, cur_bh, parent, i,
                                         &tmp_bh, search_start,
                                         min(8, end_slot - i));