linux-ext4 - [PATCH 23/31] ext4: Use a folio in ext4_da_write

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Date:   Thu, 26 Jan 2023 20:24:07 +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 23/31] ext4: Use a folio in ext4_da_write_begin()

Remove a few calls to compound_head().

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/ext4/inode.c | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e7e8f2946012..8929add6808a 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3046,7 +3046,7 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
 			       struct page **pagep, void **fsdata)
 {
 	int ret, retries = 0;
-	struct page *page;
+	struct folio *folio;
 	pgoff_t index;
 	struct inode *inode = mapping->host;
 
@@ -3073,22 +3073,23 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
 	}
 
 retry:
-	page = grab_cache_page_write_begin(mapping, index);
-	if (!page)
+	folio = __filemap_get_folio(mapping, index, FGP_WRITEBEGIN,
+			mapping_gfp_mask(mapping));
+	if (!folio)
 		return -ENOMEM;
 
-	/* In case writeback began while the page was unlocked */
-	wait_for_stable_page(page);
+	/* In case writeback began while the folio was unlocked */
+	folio_wait_stable(folio);
 
 #ifdef CONFIG_FS_ENCRYPTION
-	ret = ext4_block_write_begin(page, pos, len,
+	ret = ext4_block_write_begin(&folio->page, pos, len,
 				     ext4_da_get_block_prep);
 #else
-	ret = __block_write_begin(page, pos, len, ext4_da_get_block_prep);
+	ret = __block_write_begin(&folio->page, pos, len, ext4_da_get_block_prep);
 #endif
 	if (ret < 0) {
-		unlock_page(page);
-		put_page(page);
+		folio_unlock(folio);
+		folio_put(folio);
 		/*
 		 * block_write_begin may have instantiated a few blocks
 		 * outside i_size.  Trim these off again. Don't need
@@ -3103,7 +3104,7 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
 		return ret;
 	}
 
-	*pagep = page;
+	*pagep = &folio->page;
 	return ret;
 }
 
-- 
2.35.1