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    Subject[V2]fix ocfs2 aio/dio writing process hang

    V2 changes:
    - update the patch header of the first patch to make it more clear.

    This patch list fixes an issue about ocfs2 aio/dio write process hang.
    The call trace is like this:
    @ cat /proc/15913/stack
    @ [<ffffffffa06e1085>] ocfs2_aiodio_wait+0x85/0xc0 [ocfs2]
    @ [<ffffffffa06e3e39>] ocfs2_file_aio_write+0x99/0xa0 [ocfs2]
    @ [<ffffffff811ace97>] aio_rw_vect_retry+0x87/0x150
    @ [<ffffffff811aebd1>] aio_run_iocb+0x71/0x170
    @ [<ffffffff811af59b>] io_submit_one+0x1ab/0x280
    @ [<ffffffff811af77c>] do_io_submit+0x10c/0x1c0
    @ [<ffffffff811af840>] sys_io_submit+0x10/0x20
    @ [<ffffffff81509b42>] system_call_fastpath+0x16/0x1b
    @ [<ffffffffffffffff>] 0xffffffffffffffff

     \ /
      Last update: 2012-06-05 10:01    [W:0.025 / U:16.072 seconds]
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