提交 7b43a79f 编写于 作者: A Al Viro

mnt_flags fixes in do_remount()

* need vfsmount_lock over modifying it
* need to preserve MNT_SHARED/MNT_UNBINDABLE
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
上级 df1a1ad2
......@@ -1536,8 +1536,12 @@ static int do_remount(struct path *path, int flags, int mnt_flags,
err = change_mount_flags(path->mnt, flags);
else
err = do_remount_sb(sb, flags, data, 0);
if (!err)
if (!err) {
spin_lock(&vfsmount_lock);
mnt_flags |= path->mnt->mnt_flags & MNT_PNODE_MASK;
path->mnt->mnt_flags = mnt_flags;
spin_unlock(&vfsmount_lock);
}
up_write(&sb->s_umount);
if (!err) {
security_sb_post_remount(path->mnt, flags, data);
......
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