md faulty: use disk_stack_limits()

in:
fe86cdce block: do not artificially constrain max_sectors for stacking drivers

max_sectors defaults to UINT_MAX. md faulty wasn't using disk_stack_limits(), so inherited this large value as well. This triggered a bug in XFS when stressed over md_faulty, when a very large bio_alloc() failed.

That was on an older kernel, and I can't reproduce exactly the same thing upstream, but I think the fix is appropriate in any case.

Thanks to Mike Snitzer for pointing out the problem.

Signed-off-by Eric Sandeen <[email protected]>

---

drivers/md/faulty.c +4 -2

index 45135f6..5e7dc77 100644
@@ -315,8 +315,11 @@ static int run(struct mddev *mddev)
 	}
 	conf->nfaults = 0;
 
-	rdev_for_each(rdev, mddev)
+	rdev_for_each(rdev, mddev) {
 		conf->rdev = rdev;
+		disk_stack_limits(mddev->gendisk, rdev->bdev,
+				  rdev->data_offset << 9);
+	}
 
 	md_set_array_sectors(mddev, faulty_size(mddev, 0, 0));
 	mddev->private = conf;
 
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