Btrfs: add tree block level sanity check

With a users corrupted fs I was getting weird behavior and panics and it turns
out it was because one of his tree blocks had a bogus header level. So add this
to the sanity checks in the endio handler for tree blocks. Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>

parent 5ec8dca7

fs/btrfs/disk-io.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -613,6 +613,12 @@ static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
		goto err;
		}
		found_level = btrfs_header_level(eb);
		if (found_level >= BTRFS_MAX_LEVEL) {
		btrfs_info(root->fs_info, "bad tree block level %d\n",
		(int)btrfs_header_level(eb));
		ret = -EIO;
		goto err;
		}

		btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
		eb, found_level);