1 files changed, 4 insertions, 0 deletions
diff --git a/fs/open.c b/fs/open.c
index c4465b2f8..631aea8 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -728,6 +728,10 @@ static int do_dentry_open(struct file *f,
 		return 0;
 	}
 
+	/* POSIX.1-2008/SUSv4 Section XSI 2.9.7 */
+	if (S_ISREG(inode->i_mode))
+		f->f_mode |= FMODE_ATOMIC_POS;
+
 	f->f_op = fops_get(inode->i_fop);
 	if (unlikely(WARN_ON(!f->f_op))) {
 		error = -ENODEV;