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btrfs: Go readonly on tree errors in balance_level 

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@suse.com>
This commit is contained in:
Mark Fasheh 2011-09-01 11:27:57 -07:00 committed by David Sterba
parent b68dc2a93e
commit 305a26af5b
1 changed files with 11 additions and 2 deletions
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13
fs/btrfs/ctree.c
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@ -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;