Revert "dm: use queue_limits_set"

This reverts commit 8e0ef41.

It's broken, and causes the boot to fail on encrypted volumes.

Reported-and-bisected-by: Johannes Weiner <hannes@cmpxchg.org>
Link: https://lore.kernel.org/all/20240311235023.GA1205@cmpxchg.org/
Acked-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

block/blk-settings.c

@@ -267,7 +267,7 @@ int queue_limits_commit_update(struct request_queue *q,
 EXPORT_SYMBOL_GPL(queue_limits_commit_update);
 
 /**
- * queue_limits_set - apply queue limits to queue
+ * queue_limits_commit_set - apply queue limits to queue
  * @q:		queue to update
  * @lim:	limits to apply
  *

drivers/md/dm-table.c

@@ -1963,27 +1963,26 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
 	bool wc = false, fua = false;
 	int r;
 
+	/*
+	 * Copy table's limits to the DM device's request_queue
+	 */
+	q->limits = *limits;
+
 	if (dm_table_supports_nowait(t))
 		blk_queue_flag_set(QUEUE_FLAG_NOWAIT, q);
 	else
 		blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, q);
 
 	if (!dm_table_supports_discards(t)) {
-		limits->max_hw_discard_sectors = 0;
-		limits->discard_granularity = 0;
-		limits->discard_alignment = 0;
-		limits->discard_misaligned = 0;
+		q->limits.max_discard_sectors = 0;
+		q->limits.max_hw_discard_sectors = 0;
+		q->limits.discard_granularity = 0;
+		q->limits.discard_alignment = 0;
+		q->limits.discard_misaligned = 0;
 	}
 
-	if (!dm_table_supports_write_zeroes(t))
-		limits->max_write_zeroes_sectors = 0;
-
 	if (!dm_table_supports_secure_erase(t))
-		limits->max_secure_erase_sectors = 0;
-
-	r = queue_limits_set(q, limits);
-	if (r)
-		return r;
+		q->limits.max_secure_erase_sectors = 0;
 
 	if (dm_table_supports_flush(t, (1UL << QUEUE_FLAG_WC))) {
 		wc = true;
@@ -2008,6 +2007,9 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
 	else
 		blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
 
+	if (!dm_table_supports_write_zeroes(t))
+		q->limits.max_write_zeroes_sectors = 0;
+
 	dm_table_verify_integrity(t);
 
 	/*
@@ -2045,6 +2047,7 @@ int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
 	}
 
 	dm_update_crypto_profile(q, t);
+	disk_update_readahead(t->md->disk);
 
 	/*
 	 * Check for request-based device is left to