BUG: 9461

BUG: 9461
FILES: utils/lfs.c
1, Add filesystem summary report into 'lfs df';
2, Fixed a bug:
	Function: 	path2mnt
	Description:	next getmntent call will destroy the memory pointed by
			mnt->mnt_dir(struct mntent) gotten by previous call.

BUG: 5972
FILES: include/linux/obd.h; mds/handler.c; mds/mds_open.c; mds/lproc_mds.c
1, Add proc entry(/proc/fs/lustre/mds/mds1/atime_diff) to control atime updating
interval in MDS

OTHER:
Add changelog of BUG9461 in ChangeLog

Modified Files:
  Tag: b_release_1_4_6
 	ChangeLog include/linux/obd.h mds/handler.c mds/lproc_mds.c
 	mds/mds_open.c utils/lfs.c