do not call blocking ops when !TASK_RUNNING

[poma]

[   19.381055] ------------[ cut here ]------------
[   19.381225] WARNING: CPU: 3 PID: 487 at kernel/sched/core.c:7291 __might_sleep+0x87/0x90()
[   19.381373] do not call blocking ops when !TASK_RUNNING; state=2 set at [<ffffffff81897a65>] wait_for_completion_io+0xe5/0x140
...
[   19.387265] Call Trace:
[   19.387698]  [<ffffffff81894055>] dump_stack+0x4c/0x65
[   19.388145]  [<ffffffff810b043a>] warn_slowpath_common+0x8a/0xc0
[   19.388564]  [<ffffffff810b04c5>] warn_slowpath_fmt+0x55/0x70
[   19.388995]  [<ffffffff81897a65>] ? wait_for_completion_io+0xe5/0x140
[   19.389433]  [<ffffffff81897a65>] ? wait_for_completion_io+0xe5/0x140
[   19.389840]  [<ffffffff810e0c17>] __might_sleep+0x87/0x90
[   19.390257]  [<ffffffff813fcc1f>] generic_make_request_checks+0x3f/0x600
[   19.390666]  [<ffffffff8189d016>] ? _raw_spin_unlock_irqrestore+0x36/0x70
[   19.391084]  [<ffffffff8110e0fd>] ? trace_hardirqs_on_caller+0x13d/0x1e0
[   19.391505]  [<ffffffff813fd207>] generic_make_request+0x27/0x130
[   19.391919]  [<ffffffffa0000438>] raid1_unplug+0x108/0x160 [raid1]
[   19.392325]  [<ffffffff814030da>] blk_flush_plug_list+0x9a/0x260
[   19.392728]  [<ffffffff8189cfc0>] ? _raw_spin_unlock_irq+0x30/0x50
[   19.393142]  [<ffffffff81896410>] io_schedule_timeout+0x120/0x130
[   19.393547]  [<ffffffff8110e1ad>] ? trace_hardirqs_on+0xd/0x10
[   19.393955]  [<ffffffff81897a87>] wait_for_completion_io+0x107/0x140
[   19.394358]  [<ffffffff810e9b40>] ? wake_up_state+0x20/0x20
[   19.394757]  [<ffffffff8140adf7>] __blkdev_issue_zeroout+0x227/0x270
[   19.395162]  [<ffffffff818979ca>] ? wait_for_completion_io+0x4a/0x140
[   19.395562]  [<ffffffff8140aeea>] blkdev_issue_zeroout+0xaa/0x100
[   19.395966]  [<ffffffff81350042>] ext4_ext_zeroout.isra.34+0x52/0x60
[   19.396375]  [<ffffffff81355ff0>] ext4_ext_handle_unwritten_extents+0x680/0x10d0
[   19.396768]  [<ffffffff81356f97>] ext4_ext_map_blocks+0x527/0x13c0
[   19.397180]  [<ffffffff813234c9>] ? ext4_map_blocks+0x179/0x510
[   19.397577]  [<ffffffff813234c9>] ? ext4_map_blocks+0x179/0x510
[   19.397976]  [<ffffffff813234ed>] ext4_map_blocks+0x19d/0x510
[   19.398372]  [<ffffffff81326fdd>] ext4_writepages+0x7fd/0x13e0
[   19.398759]  [<ffffffff810f2821>] ? update_entity_load_avg+0x381/0x430
[   19.399154]  [<ffffffff81200311>] do_writepages+0x21/0x40
[   19.399536]  [<ffffffff811f1c15>] __filemap_fdatawrite_range+0x65/0x90
[   19.399916]  [<ffffffff811f1d5d>] filemap_write_and_wait_range+0x2d/0x70
[   19.400298]  [<ffffffff8131bff3>] ext4_sync_file+0x173/0x660
[   19.400669]  [<ffffffff812bcd1b>] vfs_fsync_range+0x4b/0xb0
[   19.401035]  [<ffffffff812bcddd>] do_fsync+0x3d/0x70
[   19.401389]  [<ffffffff812bd0d0>] SyS_fsync+0x10/0x20
[   19.401725]  [<ffffffff8189da6e>] system_call_fastpath+0x12/0x76
[   19.402060] ---[ end trace 21b3d7a340807572 ]---


4.1.0-0.rc2.git3.1.fc23.x86_64

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