old_bh = __find_get_block_slow(bdev, block, 0); 
old_bh = __find_get_block_slow(bdev, block); 
void unmap_underlying_metadata(struct block_device *bdev, sector_t block){	struct buffer_head *old_bh;	might_sleep();	old_bh = __find_get_block_slow(bdev, block, 0);	if (old_bh) {		clear_buffer_dirty(old_bh);		wait_on_buffer(old_bh);		clear_buffer_req(old_bh);		__brelse(old_bh);	}}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/385fd4c59d8bf7895ad3641c4cea615346f684ed/buffer.c/buggy/fs/buffer.c