f2fs: add a max block check for get_data_block_bmap
This patch adds a max block check for get_data_block_bmap.
Trinity test program will send a block number as parameter into
ioctl_fibmap, which will be used in get_node_path(), when the block
number large than f2fs max blocks, it will trigger kernel bug.
Signed-off-by: Yunlei He <heyunlei@huawei.com> Signed-off-by: Xue Liu <liuxueliu.liu@huawei.com>
[Jaegeuk Kim: fix missing condition, pointed by Chao Yu] Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>