Just before removing truncate_complete_page's BUG_ON(page_mapped(page)),
thought I'd recheck on a few filesystems.  The shame!  Easily triggered
with tmpfs: not because of recent changes, but because shmem_nopage omitted
the i_size_read from Andrea's careful truncate_count/i_size_read
/cachelookup/truncate_count sequence.  For varying reasons, other users of
shmem_getpage can't go beyond i_size, so just add it to shmem_nopage.
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>