rbd: rbd workqueues need a resque worker
Need to use WQ_MEM_RECLAIM for our workqueues to prevent I/O lockups under memory pressure - we sit on the memory reclaim path. Cc: stable@vger.kernel.org # 3.17, needs backporting for 3.16 Signed-off-by: Ilya Dryomov <idryomov@redhat.com> Tested-by: Micha Krause <micha@krausam.de> Reviewed-by: Sage Weil <sage@redhat.com>
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@ -5242,7 +5242,8 @@ static int rbd_dev_device_setup(struct rbd_device *rbd_dev)
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set_capacity(rbd_dev->disk, rbd_dev->mapping.size / SECTOR_SIZE);
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set_disk_ro(rbd_dev->disk, rbd_dev->mapping.read_only);
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rbd_dev->rq_wq = alloc_workqueue("%s", 0, 0, rbd_dev->disk->disk_name);
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rbd_dev->rq_wq = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
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rbd_dev->disk->disk_name);
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if (!rbd_dev->rq_wq) {
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ret = -ENOMEM;
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goto err_out_mapping;
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