• Andrew Morton's avatar
    [PATCH] msync correctness · 1c000719
    Andrew Morton authored
    A forward port.  At present, msync() does not report errors
    from EIO or ENOSPC.  fsync() has the same bug for mapped pages
    against the affected fd.
    
    The patch correctly propagates these errors back up from
    writepage so that fsync and msync correctly report errors.
    
    It's fairly important - msync is the only way we have
    of reporting ENOSPC against sparse mappings.
    
    Of course, you can still silently lose your data if it's kswapd who
    gets ENOSPC during writepage.  I have 3/4 of a patch for that.  It
    records the data loss so that a later msync() will report the bad
    news.
    
    This patch also adds an implementation of msync(MS_ASYNC), because
    it was easy.
    1c000719
buffer.c 66.4 KB