add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/md/dm-era-target.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #include "dm.h"
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 #include "persistent-data/dm-transaction-manager.h"
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 #include "persistent-data/dm-bitset.h"
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@@ -1151,7 +1152,6 @@
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 struct era {
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 	struct dm_target *ti;
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-	struct dm_target_callbacks callbacks;
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 	struct dm_dev *metadata_dev;
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 	struct dm_dev *origin_dev;
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@@ -1289,7 +1289,7 @@
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 			 */
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 			if (commit_needed)
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 				set_bit(get_block(era, bio), ws->bits);
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-			generic_make_request(bio);
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+			submit_bio_noacct(bio);
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 		}
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 		blk_finish_plug(&plug);
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 	}
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@@ -1396,24 +1396,12 @@
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 static void stop_worker(struct era *era)
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 {
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 	atomic_set(&era->suspended, 1);
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-	flush_workqueue(era->wq);
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+	drain_workqueue(era->wq);
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 }
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 /*----------------------------------------------------------------
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  * Target methods
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  *--------------------------------------------------------------*/
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-static int dev_is_congested(struct dm_dev *dev, int bdi_bits)
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-{
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-	struct request_queue *q = bdev_get_queue(dev->bdev);
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-	return bdi_congested(q->backing_dev_info, bdi_bits);
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-}
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-
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-static int era_is_congested(struct dm_target_callbacks *cb, int bdi_bits)
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-{
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-	struct era *era = container_of(cb, struct era, callbacks);
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-	return dev_is_congested(era->origin_dev, bdi_bits);
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-}
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-
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 static void era_destroy(struct era *era)
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 {
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 	if (era->md)
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@@ -1532,8 +1520,6 @@
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 	ti->flush_supported = true;
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 	ti->num_discard_bios = 1;
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-	era->callbacks.congested_fn = era_is_congested;
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-	dm_table_add_target_callbacks(ti->table, &era->callbacks);
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 	return 0;
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 }
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@@ -1580,6 +1566,12 @@
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 	}
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 	stop_worker(era);
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+
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+	r = metadata_commit(era->md);
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+	if (r) {
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+		DMERR("%s: metadata_commit failed", __func__);
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+		/* FIXME: fail mode */
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+	}
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 }
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 static int era_preresume(struct dm_target *ti)