struct buffer_head *bh; /* real buffer head */
struct super_block *sb; /* dev of real buffer head */
__u32 blocknr; /* block number of real buffer head, == 0 when buffer on disk */
struct buffer_head *bh; /* real buffer head */
struct super_block *sb; /* dev of real buffer head */
__u32 blocknr; /* block number of real buffer head, == 0 when buffer on disk */