MAX_LFS_FILESIZE  845 include/linux/fs.h #define MAX_LFS_FILESIZE	(((loff_t)PAGE_CACHE_SIZE << (BITS_PER_LONG-1))-1) 
MAX_LFS_FILESIZE  847 include/linux/fs.h #define MAX_LFS_FILESIZE 	((loff_t)0x7fffffffffffffffLL)