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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/block/brd.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Ram backed block device driver.
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  *
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@@ -153,6 +154,12 @@
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 		pos++;
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 		/*
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+		 * It takes 3.4 seconds to remove 80GiB ramdisk.
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+		 * So, we need cond_resched to avoid stalling the CPU.
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+		 */
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+		cond_resched();
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+
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+		/*
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 		 * This assumes radix_tree_gang_lookup always returns as
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 		 * many pages as possible. If the radix-tree code changes,
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 		 * so will this have to.
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@@ -275,7 +282,7 @@
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 	return err;
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 }
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-static blk_qc_t brd_make_request(struct request_queue *q, struct bio *bio)
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+static blk_qc_t brd_submit_bio(struct bio *bio)
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 {
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 	struct brd_device *brd = bio->bi_disk->private_data;
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 	struct bio_vec bvec;
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@@ -289,6 +296,10 @@
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 	bio_for_each_segment(bvec, bio, iter) {
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 		unsigned int len = bvec.bv_len;
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 		int err;
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+
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+		/* Don't support un-aligned buffer */
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+		WARN_ON_ONCE((bvec.bv_offset & (SECTOR_SIZE - 1)) ||
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+				(len & (SECTOR_SIZE - 1)));
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 		err = brd_do_bvec(brd, bvec.bv_page, len, bvec.bv_offset,
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 				  bio_op(bio), sector);
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@@ -319,6 +330,7 @@
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 static const struct block_device_operations brd_fops = {
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 	.owner =		THIS_MODULE,
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+	.submit_bio =		brd_submit_bio,
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 	.rw_page =		brd_rw_page,
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 };
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@@ -370,12 +382,9 @@
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 	spin_lock_init(&brd->brd_lock);
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 	INIT_RADIX_TREE(&brd->brd_pages, GFP_ATOMIC);
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-	brd->brd_queue = blk_alloc_queue(GFP_KERNEL);
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+	brd->brd_queue = blk_alloc_queue(NUMA_NO_NODE);
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 	if (!brd->brd_queue)
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 		goto out_free_dev;
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-
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-	blk_queue_make_request(brd->brd_queue, brd_make_request);
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-	blk_queue_max_hw_sectors(brd->brd_queue, 1024);
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 	/* This is so fdisk will align partitions on 4k, because of
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 	 * direct_access API needing 4k alignment, returning a PFN
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@@ -394,7 +403,6 @@
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 	disk->flags		= GENHD_FL_EXT_DEVT;
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 	sprintf(disk->disk_name, "ram%d", i);
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 	set_capacity(disk, rd_size * 2);
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-	brd->brd_queue->backing_dev_info->capabilities |= BDI_CAP_SYNCHRONOUS_IO;
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 	/* Tell the block layer that this is not a rotational device */
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 	blk_queue_flag_set(QUEUE_FLAG_NONROT, brd->brd_queue);