ovl: obsolete "check_copy_up" module option

#define OVL_COPY_UP_CHUNK_SIZE (1 << 20)

static bool __read_mostly ovl_check_copy_up;

module_param_named(check_copy_up, ovl_check_copy_up, bool,

		   S_IWUSR | S_IRUGO);

MODULE_PARM_DESC(ovl_check_copy_up,

		 "Warn on copy-up when causing process also has a R/O fd open");

static int ovl_check_fd(const void *data, struct file *f, unsigned int fd)

static int ovl_ccup_set(const char *buf, const struct kernel_param *param)

{

	const struct dentry *dentry = data;

	if (file_inode(f) == d_inode(dentry))

		pr_warn_ratelimited("overlayfs: Warning: Copying up %pD, but open R/O on fd %u which will cease to be coherent [pid=%d %s]\n",

				    f, fd, current->pid, current->comm);

	pr_warn("overlayfs: \"check_copy_up\" module option is obsolete\n");

	return 0;

}

/*

 * Check the fds open by this process and warn if something like the following

 * scenario is about to occur:

 *

 *	fd1 = open("foo", O_RDONLY);

 *	fd2 = open("foo", O_RDWR);

 */

static void ovl_do_check_copy_up(struct dentry *dentry)

static int ovl_ccup_get(char *buf, const struct kernel_param *param)

{

	if (ovl_check_copy_up)

		iterate_fd(current->files, 0, ovl_check_fd, dentry);

	return sprintf(buf, "N\n");

}

module_param_call(check_copy_up, ovl_ccup_set, ovl_ccup_get, NULL, 0644);

MODULE_PARM_DESC(ovl_check_copy_up, "Obsolete; does nothing");

int ovl_copy_xattr(struct dentry *old, struct dentry *new)

{

	ssize_t list_size, size, value_size = 0;

		if (IS_ERR(ctx.link))

			return PTR_ERR(ctx.link);

	}

	ovl_do_check_copy_up(ctx.lowerpath.dentry);

	err = ovl_copy_up_start(dentry);

	/* err < 0: interrupted, err > 0: raced with another copy-up */