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

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Message-Id: <20181117090152.29132-1-cgxu519@gmx.com>
Date:   Sat, 17 Nov 2018 17:01:52 +0800
From:   Chengguang Xu <cgxu519@....com>
To:     tytso@....edu, adilger.kernel@...ger.ca
Cc:     linux-ext4@...r.kernel.org, Chengguang Xu <cgxu519@....com>
Subject: [PATCH] ext4: 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/ext4/acl.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index c1d570ee1d9f..8c7bbf3e566d 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -248,7 +248,8 @@ ext4_set_acl(struct inode *inode, struct posix_acl *acl, int type)
 		error = posix_acl_update_mode(inode, &mode, &acl);
 		if (error)
 			goto out_stop;
-		update_mode = 1;
+		if (mode != inode->i_mode)
+			update_mode = 1;
 	}
 
 	error = __ext4_set_acl(handle, inode, type, acl, 0 /* xattr_flags */);
-- 
2.17.2