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Btrfs: check return value of btrfs_cow_block() 

The two helper functions commit_cowonly_roots() and
create_pending_snapshot() failed to check the return value from
btrfs_cow_block(), which could at least in theory fail with -ENOSPC from
btrfs_alloc_free_block(). This commit adds the missing checks.

Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
This commit is contained in:
Jan Schmidt 2012-03-23 17:24:19 +01:00
parent e565d4b962
commit 103e976616
1 changed files with 4 additions and 2 deletions
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6
fs/btrfs/transaction.c
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@ -718,7 +718,8 @@ static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans,
BUG_ON(ret);
eb = btrfs_lock_root_node(fs_info->tree_root);
btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
BUG_ON(ret);
btrfs_tree_unlock(eb);
free_extent_buffer(eb);
@ -949,7 +950,8 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
btrfs_set_root_flags(new_root_item, root_flags);
old = btrfs_lock_root_node(root);
btrfs_cow_block(trans, root, old, NULL, 0, &old);
ret = btrfs_cow_block(trans, root, old, NULL, 0, &old);
BUG_ON(ret);
btrfs_set_lock_blocking(old);
btrfs_copy_root(trans, root, old, &tmp, objectid);