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    nfs: enable swap on NFS · a564b8f0
    Mel Gorman 提交于
    Implement the new swapfile a_ops for NFS and hook up ->direct_IO.  This
    will set the NFS socket to SOCK_MEMALLOC and run socket reconnect under
    PF_MEMALLOC as well as reset SOCK_MEMALLOC before engaging the protocol
    ->connect() method.
    
    PF_MEMALLOC should allow the allocation of struct socket and related
    objects and the early (re)setting of SOCK_MEMALLOC should allow us to
    receive the packets required for the TCP connection buildup.
    
    [jlayton@redhat.com: Restore PF_MEMALLOC task flags in all cases]
    [dfeng@redhat.com: Fix handling of multiple swap files]
    [a.p.zijlstra@chello.nl: Original patch]
    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: 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>
    a564b8f0
direct.c 27.7 KB