Hi all: I readed a raid5,which size 30T.OS is RHEL6 32bit. I reaed the raid5(as a whole,not parted) and found read address which not i wanted. So I tested the newest kernel code,the problem is still. I review the code, in function do_generic_file_read() index = *ppos >> PAGE_CACHE_SHIFT; index is u32.and *ppos is long long. So when *ppos is larger than 0xFFFF FFFF * PAGE_CACHE_SHIFT(16T Byte),then the index is error. I wonder this .In 32bit os ,block devices size do not large then 16T,in other words, if block devices larger than 16T,must parted. Thanks all. -------------- majianpeng 2012-05-24 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>