[PATCH 01/30] btrfs: Use a folio in wait_dev_supers()

["Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>]

Removes a few calls to compound_head() and calls to obsolete APIs.

Cc: Chris Mason <clm@xxxxxx>
Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: David Sterba <dsterba@xxxxxxxx>
Cc: linux-btrfs@xxxxxxxxxxxxxxx
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
---
 fs/btrfs/disk-io.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3d512b041977..32cf64ccd761 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -3849,7 +3849,7 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
 		max_mirrors = BTRFS_SUPER_MIRROR_MAX;
 
 	for (i = 0; i < max_mirrors; i++) {
-		struct page *page;
+		struct folio *folio;
 
 		ret = btrfs_sb_log_location(device, i, READ, &bytenr);
 		if (ret == -ENOENT) {
@@ -3864,27 +3864,27 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
 		    device->commit_total_bytes)
 			break;
 
-		page = find_get_page(device->bdev->bd_mapping,
+		folio = filemap_get_folio(device->bdev->bd_mapping,
 				     bytenr >> PAGE_SHIFT);
-		if (!page) {
+		if (IS_ERR(folio)) {
 			errors++;
 			if (i == 0)
 				primary_failed = true;
 			continue;
 		}
-		/* Page is submitted locked and unlocked once the IO completes */
-		wait_on_page_locked(page);
-		if (PageError(page)) {
+		/* Folio is unlocked once the write completes */
+		folio_wait_locked(folio);
+		if (folio_test_error(folio)) {
 			errors++;
 			if (i == 0)
 				primary_failed = true;
 		}
 
 		/* Drop our reference */
-		put_page(page);
+		folio_put(folio);
 
 		/* Drop the reference from the writing run */
-		put_page(page);
+		folio_put(folio);
 	}
 
 	/* log error, force error return */
-- 
2.43.0