From: Matthew Wilcox (Oracle) <willy@infradead.org>
Date: Tue, 17 May 2022 22:03:27 +0000 (-0400)
Subject: btrfs: Use a folio in wait_dev_supers()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=964688b32d9ada55a7fce2e650d85ef24188f73f;p=users%2Fwilly%2Fpagecache.git

btrfs: Use a folio in wait_dev_supers()

Remove a use of PageError and optimise putting the page reference twice.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 4ba005c419836..dbac856565718 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -4178,7 +4178,7 @@ 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) {
@@ -4193,27 +4193,24 @@ static int wait_dev_supers(struct btrfs_device *device, int max_mirrors)
 		    device->commit_total_bytes)
 			break;
 
-		page = find_get_page(device->bdev->bd_inode->i_mapping,
+		folio = filemap_get_folio(device->bdev->bd_inode->i_mapping,
 				     bytenr >> PAGE_SHIFT);
-		if (!page) {
+		if (!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 IO completes */
+		folio_wait_locked(folio);
+		if (!folio_test_uptodate(folio)) {
 			errors++;
 			if (i == 0)
 				primary_failed = true;
 		}
 
-		/* Drop our reference */
-		put_page(page);
-
-		/* Drop the reference from the writing run */
-		put_page(page);
+		/* Drop our reference and the one from the writing run */
+		folio_put_refs(folio, 2);
 	}
 
 	/* log error, force error return */