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    mm: add support for direct_IO to highmem pages · 5a178119
    Mel Gorman 提交于
    The patch "mm: add support for a filesystem to activate swap files and use
    direct_IO for writing swap pages" added support for using direct_IO to
    write swap pages but it is insufficient for highmem pages.
    
    To support highmem pages, this patch kmaps() the page before calling the
    direct_IO() handler.  As direct_IO deals with virtual addresses an
    additional helper is necessary for get_kernel_pages() to lookup the struct
    page for a kmap virtual address.
    Signed-off-by: NMel Gorman <mgorman@suse.de>
    Acked-by: NRik van Riel <riel@redhat.com>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: David S. Miller <davem@davemloft.net>
    Cc: Eric B Munson <emunson@mgebm.net>
    Cc: Eric Paris <eparis@redhat.com>
    Cc: James Morris <jmorris@namei.org>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: Mike Christie <michaelc@cs.wisc.edu>
    Cc: Neil Brown <neilb@suse.de>
    Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
    Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
    Cc: Xiaotian Feng <dfeng@redhat.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    5a178119
swap.c 22.7 KB