PM: hibernate: Convert to bdev_open_by_dev()

Convert hibernation code to use bdev_open_by_dev().

CC: linux-pm@vger.kernel.org
Acked-by: Christoph Hellwig <hch@lst.de>
Acked-by: "Rafael J. Wysocki" <rafael@kernel.org>
Acked-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230927093442.25915-16-jack@suse.cz
Signed-off-by: Christian Brauner <brauner@kernel.org>

kernel/power/swap.c

@@ -222,7 +222,7 @@ int swsusp_swap_in_use(void)
  */
 
 static unsigned short root_swap = 0xffff;
-static struct block_device *hib_resume_bdev;
+static struct bdev_handle *hib_resume_bdev_handle;
 
 struct hib_bio_batch {
 	atomic_t		count;
@@ -276,7 +276,8 @@ static int hib_submit_io(blk_opf_t opf, pgoff_t page_off, void *addr,
 	struct bio *bio;
 	int error = 0;
 
-	bio = bio_alloc(hib_resume_bdev, 1, opf, GFP_NOIO | __GFP_HIGH);
+	bio = bio_alloc(hib_resume_bdev_handle->bdev, 1, opf,
+			GFP_NOIO | __GFP_HIGH);
 	bio->bi_iter.bi_sector = page_off * (PAGE_SIZE >> 9);
 
 	if (bio_add_page(bio, page, PAGE_SIZE, 0) < PAGE_SIZE) {
@@ -356,14 +357,14 @@ static int swsusp_swap_check(void)
 		return res;
 	root_swap = res;
 
-	hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device,
+	hib_resume_bdev_handle = bdev_open_by_dev(swsusp_resume_device,
 			BLK_OPEN_WRITE, NULL, NULL);
-	if (IS_ERR(hib_resume_bdev))
-		return PTR_ERR(hib_resume_bdev);
+	if (IS_ERR(hib_resume_bdev_handle))
+		return PTR_ERR(hib_resume_bdev_handle);
 
-	res = set_blocksize(hib_resume_bdev, PAGE_SIZE);
+	res = set_blocksize(hib_resume_bdev_handle->bdev, PAGE_SIZE);
 	if (res < 0)
-		blkdev_put(hib_resume_bdev, NULL);
+		bdev_release(hib_resume_bdev_handle);
 
 	return res;
 }
@@ -1522,10 +1523,10 @@ int swsusp_check(bool exclusive)
 	void *holder = exclusive ? &swsusp_holder : NULL;
 	int error;
 
-	hib_resume_bdev = blkdev_get_by_dev(swsusp_resume_device, BLK_OPEN_READ,
-					    holder, NULL);
-	if (!IS_ERR(hib_resume_bdev)) {
-		set_blocksize(hib_resume_bdev, PAGE_SIZE);
+	hib_resume_bdev_handle = bdev_open_by_dev(swsusp_resume_device,
+				BLK_OPEN_READ, holder, NULL);
+	if (!IS_ERR(hib_resume_bdev_handle)) {
+		set_blocksize(hib_resume_bdev_handle->bdev, PAGE_SIZE);
 		clear_page(swsusp_header);
 		error = hib_submit_io(REQ_OP_READ, swsusp_resume_block,
 					swsusp_header, NULL);
@@ -1550,11 +1551,11 @@ int swsusp_check(bool exclusive)
 
 put:
 		if (error)
-			blkdev_put(hib_resume_bdev, holder);
+			bdev_release(hib_resume_bdev_handle);
 		else
 			pr_debug("Image signature found, resuming\n");
 	} else {
-		error = PTR_ERR(hib_resume_bdev);
+		error = PTR_ERR(hib_resume_bdev_handle);
 	}
 
 	if (error)
@@ -1570,12 +1571,12 @@ int swsusp_check(bool exclusive)
 
 void swsusp_close(bool exclusive)
 {
-	if (IS_ERR(hib_resume_bdev)) {
+	if (IS_ERR(hib_resume_bdev_handle)) {
 		pr_debug("Image device not initialised\n");
 		return;
 	}
 
-	blkdev_put(hib_resume_bdev, exclusive ? &swsusp_holder : NULL);
+	bdev_release(hib_resume_bdev_handle);
 }
 
 /**