linux-kernel - [PATCH v2 08/16] ecryptfs: Tell the VFS that readpage was synchronous

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Date:   Fri,  9 Oct 2020 15:30:56 +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 08/16] ecryptfs: Tell the VFS that readpage was synchronous

The ecryptfs 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>
---
 fs/ecryptfs/mmap.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 019572c6b39a..dee35181d789 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -219,12 +219,13 @@ static int ecryptfs_readpage(struct file *file, struct page *page)
 		}
 	}
 out:
-	if (rc)
-		ClearPageUptodate(page);
-	else
-		SetPageUptodate(page);
-	ecryptfs_printk(KERN_DEBUG, "Unlocking page with index = [0x%.16lx]\n",
+	ecryptfs_printk(KERN_DEBUG, "Returning page with index = [0x%.16lx]\n",
 			page->index);
+	if (!rc) {
+		SetPageUptodate(page);
+		return AOP_UPDATED_PAGE;
+	}
+	ClearPageUptodate(page);
 	unlock_page(page);
 	return rc;
 }
-- 
2.28.0