Btrfs: Allow tails larger than one page

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

1 files changed, 19 insertions, 5 deletions

diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index bef61ee883e1..f691542dfa15 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -1766,8 +1766,9 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 
         /* first try to make some room by pushing left and right */
         wret = push_leaf_left(trans, root, path, data_size);
-        if (wret < 0)
+        if (wret < 0) {
                 return wret;
+        }
         if (wret) {
                 wret = push_leaf_right(trans, root, path, data_size);
                 if (wret < 0)
@@ -1777,8 +1778,9 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 
         /* did the pushes work? */
         if (btrfs_leaf_free_space(root, l) >=
-            sizeof(struct btrfs_item) + data_size)
+            sizeof(struct btrfs_item) + data_size) {
                 return 0;
+        }
 
         if (!path->nodes[1]) {
                 ret = insert_new_root(trans, root, path, 1);
@@ -1822,7 +1824,11 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
                                 return ret;
                         }
                         mid = slot;
-                        double_split = 1;
+                        if (mid != nritems &&
+                            leaf_space_used(l, mid, nritems - mid) +
+                            space_needed > BTRFS_LEAF_DATA_SIZE(root)) {
+                                double_split = 1;
+                        }
                 }
         } else {
                 if (leaf_space_used(l, 0, mid + 1) + space_needed >
@@ -1910,8 +1916,9 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
 
         BUG_ON(path->slots[0] < 0);
 
-        if (!double_split)
+        if (!double_split) {
                 return ret;
+        }
 
         right = btrfs_alloc_free_block(trans, root, root->leafsize,
                                        l->start, 0);
@@ -2048,7 +2055,11 @@ int btrfs_extend_item(struct btrfs_trans_handle *trans,
         old_data = btrfs_item_end_nr(leaf, slot);
 
         BUG_ON(slot < 0);
-        BUG_ON(slot >= nritems);
+        if (slot >= nritems) {
+                btrfs_print_leaf(root, leaf);
+                printk("slot %d too large, nritems %d\n", slot, nritems);
+                BUG_ON(1);
+        }
 
         /*
          * item0..itemN ... dataN.offset..dataN.size .. data0.size
@@ -2132,6 +2143,9 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
 
         if (btrfs_leaf_free_space(root, leaf) <
             sizeof(struct btrfs_item) + data_size) {
+                btrfs_print_leaf(root, leaf);
+                printk("not enough freespace need %u have %d\n",
+                       data_size, btrfs_leaf_free_space(root, leaf));
                 BUG();
         }