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-rw-r--r--fs/btrfs/ctree.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index d61ea238ad8a..7dbfa365eb18 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -4324,8 +4324,18 @@ again:
else
btrfs_item_key(l, &disk_key, mid);
+ /*
+ * We have to about BTRFS_NESTING_NEW_ROOT here if we've done a double
+ * split, because we're only allowed to have MAX_LOCKDEP_SUBCLASSES
+ * subclasses, which is 8 at the time of this patch, and we've maxed it
+ * out. In the future we could add a
+ * BTRFS_NESTING_SPLIT_THE_SPLITTENING if we need to, but for now just
+ * use BTRFS_NESTING_NEW_ROOT.
+ */
right = alloc_tree_block_no_bg_flush(trans, root, 0, &disk_key, 0,
- l->start, 0, BTRFS_NESTING_SPLIT);
+ l->start, 0, num_doubles ?
+ BTRFS_NESTING_NEW_ROOT :
+ BTRFS_NESTING_SPLIT);
if (IS_ERR(right))
return PTR_ERR(right);