60 static int proc_parse_hidepid_param(struct fs_context *fc, struct fs_parameter *param)  in proc_parse_hidepid_param()  argument
62 	struct proc_fs_context *ctx = fc->fs_private;  in proc_parse_hidepid_param()
68 		return invalf(fc, "proc: unexpected type of hidepid value\n");  in proc_parse_hidepid_param()
72 			return invalf(fc, "proc: unknown value of hidepid - %s\n", param->string);  in proc_parse_hidepid_param()
86 		return invalf(fc, "proc: unknown value of hidepid - %s\n", param->string);  in proc_parse_hidepid_param()
91 static int proc_parse_subset_param(struct fs_context *fc, char *value)  in proc_parse_subset_param()  argument
93 	struct proc_fs_context *ctx = fc->fs_private;  in proc_parse_subset_param()
105 				return invalf(fc, "proc: unsupported subset option - %s\n", value);  in proc_parse_subset_param()
115 static int proc_parse_pidns_param(struct fs_context *fc,  in proc_parse_pidns_param()  argument
119 	struct proc_fs_context *ctx = fc->fs_private;  in proc_parse_pidns_param()
139 		errorfc(fc, "could not get file from pidns argument");  in proc_parse_pidns_param()
144 		return invalfc(fc, "pidns argument is not an nsfs file");  in proc_parse_pidns_param()
147 		return invalfc(fc, "pidns argument is not a pidns file");  in proc_parse_pidns_param()
155 		errorfc(fc, "insufficient permissions to set pidns");  in proc_parse_pidns_param()
159 		return invalfc(fc, "cannot set pidns to non-descendant pidns");  in proc_parse_pidns_param()
163 	put_user_ns(fc->user_ns);  in proc_parse_pidns_param()
164 	fc->user_ns = get_user_ns(ctx->pid_ns->user_ns);  in proc_parse_pidns_param()
169 static int proc_parse_param(struct fs_context *fc, struct fs_parameter *param)  in proc_parse_param()  argument
171 	struct proc_fs_context *ctx = fc->fs_private;  in proc_parse_param()
175 	opt = fs_parse(fc, proc_fs_parameters, param, &result);  in proc_parse_param()
185 		err = proc_parse_hidepid_param(fc, param);  in proc_parse_param()
191 		err = proc_parse_subset_param(fc, param->string);  in proc_parse_param()
205 		if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {  in proc_parse_param()
206 			errorfc(fc, "cannot reconfigure pidns for existing procfs");  in proc_parse_param()
209 		err = proc_parse_pidns_param(fc, param, &result);  in proc_parse_param()
214 		errorfc(fc, "pidns mount flag not supported on this system");  in proc_parse_param()
227 			       struct fs_context *fc,  in proc_apply_options()  argument
230 	struct proc_fs_context *ctx = fc->fs_private;  in proc_apply_options()
239 	    !WARN_ON_ONCE(fc->purpose == FS_CONTEXT_FOR_RECONFIGURE)) {  in proc_apply_options()
245 static int proc_fill_super(struct super_block *s, struct fs_context *fc)  in proc_fill_super()  argument
247 	struct proc_fs_context *ctx = fc->fs_private;  in proc_fill_super()
257 	proc_apply_options(fs_info, fc, current_user_ns());  in proc_fill_super()
299 static int proc_reconfigure(struct fs_context *fc)  in proc_reconfigure()  argument
301 	struct super_block *sb = fc->root->d_sb;  in proc_reconfigure()
306 	proc_apply_options(fs_info, fc, current_user_ns());  in proc_reconfigure()
310 static int proc_get_tree(struct fs_context *fc)  in proc_get_tree()  argument
312 	return get_tree_nodev(fc, proc_fill_super);  in proc_get_tree()
315 static void proc_fs_context_free(struct fs_context *fc)  in proc_fs_context_free()  argument
317 	struct proc_fs_context *ctx = fc->fs_private;  in proc_fs_context_free()
330 static int proc_init_fs_context(struct fs_context *fc)  in proc_init_fs_context()  argument
339 	put_user_ns(fc->user_ns);  in proc_init_fs_context()
340 	fc->user_ns = get_user_ns(ctx->pid_ns->user_ns);  in proc_init_fs_context()
341 	fc->fs_private = ctx;  in proc_init_fs_context()
342 	fc->ops = &proc_fs_context_ops;  in proc_init_fs_context()