linux-ext4 - [PATCH 11/31] ext4: Convert ext4_try_to_write_inline

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Date:   Thu, 26 Jan 2023 20:23:55 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     "Theodore Tso" <tytso@....edu>,
        Andreas Dilger <adilger.kernel@...ger.ca>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH 11/31] ext4: Convert ext4_try_to_write_inline_data() to use a folio

Saves a number of calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/ext4/inline.c | 24 +++++++++++-------------
 1 file changed, 11 insertions(+), 13 deletions(-)

diff --git a/fs/ext4/inline.c b/fs/ext4/inline.c
index 2091077e37dc..6d136353ccc2 100644
--- a/fs/ext4/inline.c
+++ b/fs/ext4/inline.c
@@ -654,8 +654,7 @@ int ext4_try_to_write_inline_data(struct address_space *mapping,
 {
 	int ret;
 	handle_t *handle;
-	unsigned int flags;
-	struct page *page;
+	struct folio *folio;
 	struct ext4_iloc iloc;
 
 	if (pos + len > ext4_get_max_inline_size(inode))
@@ -692,28 +691,27 @@ int ext4_try_to_write_inline_data(struct address_space *mapping,
 	if (ret)
 		goto out;
 
-	flags = memalloc_nofs_save();
-	page = grab_cache_page_write_begin(mapping, 0);
-	memalloc_nofs_restore(flags);
-	if (!page) {
+	folio = __filemap_get_folio(mapping, 0, FGP_WRITEBEGIN | FGP_NOFS,
+					mapping_gfp_mask(mapping));
+	if (!folio) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	*pagep = page;
+	*pagep = &folio->page;
 	down_read(&EXT4_I(inode)->xattr_sem);
 	if (!ext4_has_inline_data(inode)) {
 		ret = 0;
-		unlock_page(page);
-		put_page(page);
+		folio_unlock(folio);
+		folio_put(folio);
 		goto out_up_read;
 	}
 
-	if (!PageUptodate(page)) {
-		ret = ext4_read_inline_page(inode, page);
+	if (!folio_test_uptodate(folio)) {
+		ret = ext4_read_inline_page(inode, &folio->page);
 		if (ret < 0) {
-			unlock_page(page);
-			put_page(page);
+			folio_unlock(folio);
+			folio_put(folio);
 			goto out_up_read;
 		}
 	}
-- 
2.35.1