linux-ext4 - [PATCH] ext2: compare old and new mode before setting update

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Message-Id: <20181117090100.29063-1-cgxu519@gmx.com>
Date:   Sat, 17 Nov 2018 17:01:00 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     jack@...e.com
Cc:     linux-ext4@...r.kernel.org, Chengguang Xu <cgxu519@....com>
Subject: [PATCH] ext2: compare old and new mode before setting update_mode flag

If new mode is the same as old mode we don't have to reset
inode mode in the rest of the code, so compare old and new
mode before setting update_mode flag.

Signed-off-by: Chengguang Xu <cgxu519@....com>
---
 fs/ext2/acl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index cf4c77f8dd08..f4dd728393c8 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -226,7 +226,8 @@ ext2_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 		error = posix_acl_update_mode(inode, &mode, &acl);
 		if (error)
 			return error;
-		update_mode = 1;
+		if (mode != inode->i_mode)
+			update_mode = 1;
 	}
 	error = __ext2_set_acl(inode, acl, type);
 	if (!error && update_mode) {
-- 
2.17.2