ctime set by truncate even if NOCMTIME requested

[Steve French <smfrench@austin.rr.com>]

I am seeing requests to set ctime on truncate which does not make any 
sense to me as I was testing with the flag that should have turned that 
off.  ie my inodes having S_NOCMTIME set, as NFS does.

do_truncate (line 206 of open.c) sets
     newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME
instead of
      newattrs.ia_valid = ATTR_SIZE;
     if(!IS_NOCMTIME(inode))
          newattrs.ia_valid |= ATTR_CTIME;

I thought that the correct way to handle this for network filesystems, 
is to let the server set the mtime and ctime unless the application 
explicitly sets the attributes (in the case of the sys call truncate or 
ftruncate the application is not explicitly setting the ctime/mtime as 
it would on a backup/restore so they should be ignored for the network 
fs so the server will set it correctl to its time, reducing traffic and 
more accurately representing the time it got updated).

Shouldn't there be a IS_NOCMTIME check in the truncate path in fs/open.c?
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