linux-kernel - [PATCH 3.2 147/152] Btrfs: skip adding an acl attribute if we don't have to

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Date:   Mon, 14 Nov 2016 00:14:07 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Chris Mason" <chris.mason@...ionio.com>,
        "Liu Bo" <bo.li.liu@...cle.com>
Subject: [PATCH 3.2 147/152] Btrfs: skip adding an acl attribute if we
 don't have to

3.2.84-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Liu Bo <bo.li.liu@...cle.com>

commit 755ac67f83e515af55adbfe55134eb7d90839cdb upstream.

If the acl can be exactly represented in the traditional file
mode permission bits, we don't set another acl attribute.

Signed-off-by: Liu Bo <bo.li.liu@...cle.com>
Signed-off-by: Chris Mason <chris.mason@...ionio.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 fs/btrfs/acl.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/fs/btrfs/acl.c
+++ b/fs/btrfs/acl.c
@@ -121,6 +121,8 @@ static int btrfs_set_acl(struct btrfs_tr
 			ret = posix_acl_equiv_mode(acl, &inode->i_mode);
 			if (ret < 0)
 				return ret;
+			if (ret == 0)
+				acl = NULL;
 		}
 		ret = 0;
 		break;