fs/overlayfs/params.c

42 module_param_named(metacopy, ovl_metacopy_def, bool, 0644);
43 MODULE_PARM_DESC(metacopy,
155 	fsparam_enum("metacopy",            Opt_metacopy, ovl_parameter_bool),
614 		config->metacopy = result.uint_32;
615 		ctx->set.metacopy = true;
731 	ofs->config.metacopy		= ovl_metacopy_def;
785 	if (ctx->nr_data > 0 && !config->metacopy) {
786 		pr_err("lower data-only dirs require metacopy support.\n");
815 	/* Resolve verity -> metacopy dependency */
816 	if (config->verity_mode && !config->metacopy) {
818 		if (set.metacopy) {
819 			pr_err("conflicting options: metacopy=off,verity=%s\n",
823 		/* Otherwise automatically enable metacopy. */
824 		config->metacopy = true;
834 	/* Resolve verity -> metacopy -> redirect_dir dependency */
835 	if (config->metacopy && config->redirect_mode != OVL_REDIRECT_ON) {
836 		if (set.metacopy && set.redirect) {
837 			pr_err("conflicting options: metacopy=on,redirect_dir=%s\n",
851 			pr_info("disabling metacopy due to redirect_dir=%s\n",
853 			config->metacopy = false;
882 	/* Resolve nfs_export -> !metacopy && !verity dependency */
883 	if (config->nfs_export && config->metacopy) {
884 		if (set.nfs_export && set.metacopy) {
885 			pr_err("conflicting options: nfs_export=on,metacopy=on\n");
888 		if (set.metacopy) {
890 			 * There was an explicit metacopy=on that resulted
893 			pr_info("disabling nfs_export due to metacopy=on\n");
908 			pr_info("disabling metacopy due to nfs_export=on\n");
909 			config->metacopy = false;
914 	/* Resolve userxattr -> !redirect && !metacopy && !verity dependency */
922 		if (config->metacopy && set.metacopy) {
923 			pr_err("conflicting options: userxattr,metacopy=on\n");
932 		 * Silently disable default setting of redirect and metacopy.
938 		config->metacopy = false;
997 	if (ofs->config.metacopy != ovl_metacopy_def)
998 		seq_printf(m, ",metacopy=%s",
999 			   ofs->config.metacopy ? "on" : "off");