add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/dm-thin.c
..
..
@@ -2217,6 +2217,7 @@
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 			throttle_work_update(&pool->throttle);
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 			dm_pool_issue_prefetches(pool->pmd);
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 		}
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+		cond_resched();
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 	}
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 	blk_finish_plug(&plug);
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 }
..
..
@@ -2299,6 +2300,7 @@
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 			else
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 				pool->process_cell(tc, cell);
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 		}
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+		cond_resched();
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 	} while (!list_empty(&cells));
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 }
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..
..
@@ -2907,6 +2909,8 @@
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 	dm_bio_prison_destroy(pool->prison);
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 	dm_kcopyd_client_destroy(pool->copier);
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+	cancel_delayed_work_sync(&pool->waker);
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+	cancel_delayed_work_sync(&pool->no_space_timeout);
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 	if (pool->wq)
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 		destroy_workqueue(pool->wq);
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..
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@@ -3379,6 +3383,7 @@
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 	pt->low_water_blocks = low_water_blocks;
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 	pt->adjusted_pf = pt->requested_pf = pf;
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 	ti->num_flush_bios = 1;
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+	ti->limit_swap_bios = true;
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 	/*
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 	 * Only need to enable discards if the pool should pass
..
..
@@ -3566,20 +3571,28 @@
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 	 */
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 	r = bind_control_target(pool, ti);
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 	if (r)
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-		return r;
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+		goto out;
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 	r = maybe_resize_data_dev(ti, &need_commit1);
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 	if (r)
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-		return r;
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+		goto out;
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 	r = maybe_resize_metadata_dev(ti, &need_commit2);
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 	if (r)
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-		return r;
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+		goto out;
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 	if (need_commit1 || need_commit2)
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 		(void) commit(pool);
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+out:
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+	/*
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+	 * When a thin-pool is PM_FAIL, it cannot be rebuilt if
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+	 * bio is in deferred list. Therefore need to return 0
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+	 * to allow pool_resume() to flush IO.
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+	 */
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+	if (r && get_pool_mode(pool) == PM_FAIL)
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+		r = 0;
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-	return 0;
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+	return r;
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 }
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 static void pool_suspend_active_thins(struct pool *pool)
..
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@@ -4247,6 +4260,7 @@
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 		goto bad;
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 	ti->num_flush_bios = 1;
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+	ti->limit_swap_bios = true;
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 	ti->flush_supported = true;
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 	ti->per_io_data_size = sizeof(struct dm_thin_endio_hook);
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