[PATCH] f2fs: fix to set noatime and immutable flag for quota file

[Chao Yu]

We should set noatime bit for quota files, since no one cares about
atime of quota file, and we should set immutalbe bit as well, due to
nobody should write to the file through exported interfaces.

Meanwhile this patch use inode_lock to avoid race condition during
inode->i_flags, f2fs_inode->i_flags update.

Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
 fs/f2fs/super.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 9f15b03037db..5d3ac196f0d5 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2713,6 +2713,7 @@ static int f2fs_quota_enable(struct super_block *sb, int type, int format_id,
 {
 	struct inode *qf_inode;
 	unsigned long qf_inum;
+	unsigned int qf_flag = F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL;
 	int err;
 
 	BUG_ON(!f2fs_sb_has_quota_ino(F2FS_SB(sb)));
@@ -2728,7 +2729,15 @@ static int f2fs_quota_enable(struct super_block *sb, int type, int format_id,
 	}
 
 	/* Don't account quota for quota files to avoid recursion */
+	inode_lock(qf_inode);
 	qf_inode->i_flags |= S_NOQUOTA;
+
+	if (!(F2FS_I(qf_inode)->i_flags & qf_flag)) {
+		F2FS_I(qf_inode)->i_flags |= qf_flag;
+		f2fs_set_inode_flags(qf_inode);
+	}
+	inode_unlock(qf_inode);
+
 	err = dquot_load_quota_inode(qf_inode, type, format_id, flags);
 	iput(qf_inode);
 	return err;
-- 
2.25.1