• David Chinner's avatar
    [FS] Implement block_page_mkwrite. · 54171690
    David Chinner authored
    Many filesystems need a ->page-mkwrite callout to correctly
    set up pages that have been written to by mmap. This is especially
    important when mmap is writing into holes as it allows filesystems
    to correctly account for and allocate space before the mmap
    write is allowed to proceed.
    
    Protection against truncate races is provided by locking the page
    and checking to see whether the page mapping is correct and whether
    it is beyond EOF so we don't end up allowing allocations beyond
    the current EOF or changing EOF as a result of a mmap write.
    
    SGI-PV: 940392
    SGI-Modid: 2.6.x-xfs-melb:linux:29146a
    Signed-off-by: default avatarDavid Chinner <dgc@sgi.com>
    Signed-off-by: default avatarChristoph Hellwig <hch@infradead.org>
    Signed-off-by: default avatarTim Shimmin <tes@sgi.com>
    54171690
buffer.c 80.5 KB