linux-kernel - [PATCH v2 12/16] ubifs: Tell the VFS that readpage was synchronous

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Message-Id: <20201009143104.22673-13-willy@infradead.org>
Date:   Fri,  9 Oct 2020 15:31:00 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-mm@...ck.org, v9fs-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
        ceph-devel@...r.kernel.org, linux-cifs@...r.kernel.org,
        ecryptfs@...r.kernel.org, linux-um@...ts.infradead.org,
        linux-mtd@...ts.infradead.org, Richard Weinberger <richard@....at>,
        linux-xfs@...r.kernel.org
Subject: [PATCH v2 12/16] ubifs: Tell the VFS that readpage was synchronous

The ubifs readpage implementation was already synchronous, so use
AOP_UPDATED_PAGE to avoid cycling the page lock.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Acked-by: Richard Weinberger <richard@....at>
---
 fs/ubifs/file.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index b77d1637bbbc..82633509c45e 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -772,7 +772,6 @@ static int ubifs_do_bulk_read(struct ubifs_info *c, struct bu_info *bu,
 	if (err)
 		goto out_warn;
 
-	unlock_page(page1);
 	ret = 1;
 
 	isize = i_size_read(inode);
@@ -892,11 +891,16 @@ static int ubifs_bulk_read(struct page *page)
 
 static int ubifs_readpage(struct file *file, struct page *page)
 {
-	if (ubifs_bulk_read(page))
-		return 0;
-	do_readpage(page);
-	unlock_page(page);
-	return 0;
+	int err;
+
+	err = ubifs_bulk_read(page);
+	if (err == 0)
+		err = do_readpage(page);
+	if (err < 0) {
+		unlock_page(page);
+		return err;
+	}
+	return AOP_UPDATED_PAGE;
 }
 
 static int do_writepage(struct page *page, int len)
-- 
2.28.0