• Linus Torvalds's avatar
    VM: Remove "clear_page_dirty()" and "test_clear_page_dirty()" functions · fba2591b
    Linus Torvalds authored
    They were horribly easy to mis-use because of their tempting naming, and
    they also did way more than any users of them generally wanted them to
    do.
    
    A dirty page can become clean under two circumstances:
    
     (a) when we write it out.  We have "clear_page_dirty_for_io()" for
         this, and that function remains unchanged.
    
         In the "for IO" case it is not sufficient to just clear the dirty
         bit, you also have to mark the page as being under writeback etc.
    
     (b) when we actually remove a page due to it becoming inaccessible to
         users, notably because it was truncate()'d away or the file (or
         metadata) no longer exists, and we thus want to cancel any
         outstanding dirty state.
    
    For the (b) case, we now introduce "cancel_dirty_page()", which only
    touches the page state itself, and verifies that the page is not mapped
    (since cancelling writes on a mapped page would be actively wrong as it
    is still accessible to users).
    
    Some filesystems need to be fixed up for this: CIFS, FUSE, JFS,
    ReiserFS, XFS all use the old confusing functions, and will be fixed
    separately in subsequent commits (with some of them just removing the
    offending logic, and others using clear_page_dirty_for_io()).
    
    This was confirmed by Martin Michlmayr to fix the apt database
    corruption on ARM.
    
    Cc: Martin Michlmayr <tbm@cyrius.com>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Hugh Dickins <hugh@veritas.com>
    Cc: Nick Piggin <nickpiggin@yahoo.com.au>
    Cc: Arjan van de Ven <arjan@infradead.org>
    Cc: Andrei Popa <andrei.popa@i-neo.ro>
    Cc: Andrew Morton <akpm@osdl.org>
    Cc: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
    Cc: Gordon Farquharson <gordonfarquharson@gmail.com>
    Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
    Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    fba2591b
inode.c 19.5 KB