linux-ext4 - [RFC v3 2/7] iomap: Add iomap_folio

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Date:   Fri, 16 Dec 2022 16:06:21 +0100
From:   Andreas Gruenbacher <agruenba@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Matthew Wilcox <willy@...radead.org>
Cc:     Andreas Gruenbacher <agruenba@...hat.com>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, cluster-devel@...hat.com
Subject: [RFC v3 2/7] iomap: Add iomap_folio_done helper

Add an iomap_folio_done() helper to encapsulate unlocking the folio,
calling ->page_done(), and putting the folio.  This doesn't change the
functionality.

Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
---
 fs/iomap/buffered-io.c | 28 +++++++++++++++++-----------
 1 file changed, 17 insertions(+), 11 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 347010c6a652..8ce9abb29d46 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -575,6 +575,19 @@ static int __iomap_write_begin(const struct iomap_iter *iter, loff_t pos,
 	return 0;
 }
 
+static void iomap_folio_done(struct iomap_iter *iter, loff_t pos, size_t ret,
+		struct folio *folio)
+{
+	const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
+
+	if (folio)
+		folio_unlock(folio);
+	if (page_ops && page_ops->page_done)
+		page_ops->page_done(iter->inode, pos, ret, &folio->page);
+	if (folio)
+		folio_put(folio);
+}
+
 static int iomap_write_begin_inline(const struct iomap_iter *iter,
 		struct folio *folio)
 {
@@ -616,7 +629,8 @@ static int iomap_write_begin(struct iomap_iter *iter, loff_t pos,
 			fgp, mapping_gfp_mask(iter->inode->i_mapping));
 	if (!folio) {
 		status = (iter->flags & IOMAP_NOWAIT) ? -EAGAIN : -ENOMEM;
-		goto out_no_page;
+		iomap_folio_done(iter, pos, 0, NULL);
+		return status;
 	}
 
 	/*
@@ -656,13 +670,9 @@ static int iomap_write_begin(struct iomap_iter *iter, loff_t pos,
 	return 0;
 
 out_unlock:
-	folio_unlock(folio);
-	folio_put(folio);
+	iomap_folio_done(iter, pos, 0, folio);
 	iomap_write_failed(iter->inode, pos, len);
 
-out_no_page:
-	if (page_ops && page_ops->page_done)
-		page_ops->page_done(iter->inode, pos, 0, NULL);
 	return status;
 }
 
@@ -712,7 +722,6 @@ static size_t iomap_write_end_inline(const struct iomap_iter *iter,
 static size_t iomap_write_end(struct iomap_iter *iter, loff_t pos, size_t len,
 		size_t copied, struct folio *folio)
 {
-	const struct iomap_page_ops *page_ops = iter->iomap.page_ops;
 	const struct iomap *srcmap = iomap_iter_srcmap(iter);
 	loff_t old_size = iter->inode->i_size;
 	size_t ret;
@@ -736,11 +745,8 @@ static size_t iomap_write_end(struct iomap_iter *iter, loff_t pos, size_t len,
 		iter->iomap.flags |= IOMAP_F_SIZE_CHANGED;
 		folio_may_straddle_isize(iter->inode, folio, old_size, pos);
 	}
-	folio_unlock(folio);
 
-	if (page_ops && page_ops->page_done)
-		page_ops->page_done(iter->inode, pos, ret, &folio->page);
-	folio_put(folio);
+	iomap_folio_done(iter, pos, ret, folio);
 
 	if (ret < len)
 		iomap_write_failed(iter->inode, pos + ret, len - ret);
-- 
2.38.1