From 8d9032267437ca7c79756a8b544e075db40080fc Mon Sep 17 00:00:00 2001
From: Fengnan Chang <changfengnan@vivo.com>
Date: Tue, 22 Jun 2021 19:50:59 +0800
Subject: [PATCH] f2fs: compress: remove unneeded read when rewrite whole
 cluster

when we overwrite the whole page in cluster, we don't need read original
data before write, because after write_end(), writepages() can help to
load left data in that cluster.

Signed-off-by: Fengnan Chang <changfengnan@vivo.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Acked-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/data.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 59534040c929..d4b7503a6209 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3340,6 +3340,9 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
 
 		*fsdata = NULL;
 
+		if (len == PAGE_SIZE)
+			goto repeat;
+
 		ret = f2fs_prepare_compress_overwrite(inode, pagep,
 							index, fsdata);
 		if (ret < 0) {