linux-kernel - [PATCH 5.1 049/155] f2fs: fix to use inline space only if inline

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Date:   Thu, 13 Jun 2019 10:32:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chao Yu <yuchao0@...wei.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.1 049/155] f2fs: fix to use inline space only if inline_xattr is enable

[ Upstream commit 622927f3b8809206f6da54a6a7ed4df1a7770fce ]

With below mkfs and mount option:

MKFS_OPTIONS  -- -O extra_attr -O project_quota -O inode_checksum -O flexible_inline_xattr -O inode_crtime -f
MOUNT_OPTIONS -- -o noinline_xattr

We may miss xattr data with below testcase:
- mkdir dir
- setfattr -n "user.name" -v 0 dir
- for ((i = 0; i < 190; i++)) do touch dir/$i; done
- umount
- mount
- getfattr -n "user.name" dir

user.name: No such attribute

The root cause is that we persist xattr data into reserved inline xattr
space, even if inline_xattr is not enable in inline directory inode, after
inline dentry conversion, reserved space no longer exists, so that xattr
data missed.

Let's use inline xattr space only if inline_xattr flag is set on inode
to fix this iusse.

Fixes: 6afc662e68b5 ("f2fs: support flexible inline xattr size")
Signed-off-by: Chao Yu <yuchao0@...wei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/f2fs/f2fs.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 74f06f12110f..10240fbdd396 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2579,7 +2579,9 @@ static inline void *inline_xattr_addr(struct inode *inode, struct page *page)
 
 static inline int inline_xattr_size(struct inode *inode)
 {
-	return get_inline_xattr_addrs(inode) * sizeof(__le32);
+	if (f2fs_has_inline_xattr(inode))
+		return get_inline_xattr_addrs(inode) * sizeof(__le32);
+	return 0;
 }
 
 static inline int f2fs_has_inline_data(struct inode *inode)
-- 
2.20.1