Hi I've goten error hen using mmap,the error come from for(i=0;i<mapsize;i++) maddr[i]='A'; when i=12288 it return bus error. I have a suspicion at extents_holes: if(i_size <=foff+len) return -EIO; here should be changed to if(i_size <foff+len) return -EIO; -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html