lustre/kernel_patches/patches/raid5-mmp-unplug-dev.patch

   1 Index: linux-2.6.22.14/drivers/md/raid5.c
   2 ===================================================================
   3 --- linux-2.6.22.14.orig/drivers/md/raid5.c
   4 +++ linux-2.6.22.14/drivers/md/raid5.c
   5 @@ -1268,6 +1268,8 @@ static int add_stripe_bio(struct stripe_
   6                 bi->bi_next = *bip;
   7         *bip = bi;
   8         bi->bi_phys_segments ++;
   9 +       if (bio_sync(bi) && !forwrite)
  10 +               clear_bit(R5_UPTODATE, &sh->dev[dd_idx].flags); /* force to read from disk. */
  11         spin_unlock_irq(&conf->device_lock);
  12         spin_unlock(&sh->lock);
  13
  14 @@ -2972,6 +2974,8 @@ static int make_request(request_queue_t
  15                               test_bit(BIO_UPTODATE, &bi->bi_flags)
  16                                 ? 0 : -EIO);
  17         }
  18 +       if (bio_sync(bi))
  19 +               raid5_unplug_device(q);
  20         return 0;
  21  }
  22