From: Fengnan Chang <changfengnan@vivo.com>
Date: Tue, 22 Jun 2021 11:50:59 +0000 (+0800)
Subject: f2fs: compress: remove unneeded read when rewrite whole cluster
X-Git-Tag: v5.10.110~415
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=1c4d94e4f0b14a5a5cdf558e22af490aacb6a766;p=users%2Fdwmw2%2Flinux.git

f2fs: compress: remove unneeded read when rewrite whole cluster

[ Upstream commit 7eab7a6968278c735b1ca6387056a408f7960265 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index d27a92a544470..04e980c583195 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -3461,6 +3461,9 @@ 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) {