balace_level() seems to deal with missing tree nodes by BUG_ON(). Instead,
we can easily just set the file system readonly and bubble -EROFS back up
the stack.
Signed-off-by: Mark Fasheh <mfasheh@xxxxxxxx>
---
fs/btrfs/ctree.c | 13 +++++++++++--
1 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 36e16bd..651a26a 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -944,7 +944,12 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
/* promote the child to a root */
child = read_node_slot(root, mid, 0);
- BUG_ON(!child);
+ if (!child) {
+ ret = -EROFS;
+ btrfs_std_error(root->fs_info, ret);
+ goto enospc;
+ }
+
btrfs_tree_lock(child);
btrfs_set_lock_blocking(child);
ret = btrfs_cow_block(trans, root, child, mid, 0, &child);
@@ -1042,7 +1047,11 @@ static noinline int balance_level(struct btrfs_trans_handle *trans,
* otherwise we would have pulled some pointers from the
* right
*/
- BUG_ON(!left);
+ if (!left) {
+ ret = -EROFS;
+ btrfs_std_error(root->fs_info, ret);
+ goto enospc;
+ }
wret = balance_node_right(trans, root, mid, left);
if (wret < 0) {
ret = wret;
--
1.7.9
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