fsdax: invalidate pages when CoW

CoW changes the share state of a dax page, but the share count of the page
isn't updated.  The next time access this page, it should have been a
newly accessed, but old association exists.  So, we need to clear the
share state when CoW happens, in both dax_iomap_rw() and dax_zero_iter().

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Shiyang Ruan <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: John Hubbard <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

0 files changed, 0 insertions, 0 deletions