39 static int legacy_init_fs_context(struct fs_context *fc);
61 static int vfs_parse_sb_flag(struct fs_context *fc, const char *key)  in vfs_parse_sb_flag()  argument
67 		fc->sb_flags |= token;  in vfs_parse_sb_flag()
68 		fc->sb_flags_mask |= token;  in vfs_parse_sb_flag()
74 		fc->sb_flags &= ~token;  in vfs_parse_sb_flag()
75 		fc->sb_flags_mask |= token;  in vfs_parse_sb_flag()
94 int vfs_parse_fs_param_source(struct fs_context *fc, struct fs_parameter *param)  in vfs_parse_fs_param_source()  argument
100 		return invalf(fc, "Non-string source");  in vfs_parse_fs_param_source()
102 	if (fc->source)  in vfs_parse_fs_param_source()
103 		return invalf(fc, "Multiple sources");  in vfs_parse_fs_param_source()
105 	fc->source = param->string;  in vfs_parse_fs_param_source()
127 int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param)  in vfs_parse_fs_param()  argument
132 		return invalf(fc, "Unnamed parameter\n");  in vfs_parse_fs_param()
134 	ret = vfs_parse_sb_flag(fc, param->key);  in vfs_parse_fs_param()
138 	ret = security_fs_context_parse_param(fc, param);  in vfs_parse_fs_param()
145 	if (fc->ops->parse_param) {  in vfs_parse_fs_param()
146 		ret = fc->ops->parse_param(fc, param);  in vfs_parse_fs_param()
154 	ret = vfs_parse_fs_param_source(fc, param);  in vfs_parse_fs_param()
158 	return invalf(fc, "%s: Unknown parameter '%s'",  in vfs_parse_fs_param()
159 		      fc->fs_type->name, param->key);  in vfs_parse_fs_param()
166 int vfs_parse_fs_string(struct fs_context *fc, const char *key,  in vfs_parse_fs_string()  argument
184 	ret = vfs_parse_fs_param(fc, &param);  in vfs_parse_fs_string()
201 int generic_parse_monolithic(struct fs_context *fc, void *data)  in generic_parse_monolithic()  argument
209 	ret = security_sb_eat_lsm_opts(options, &fc->security);  in generic_parse_monolithic()
224 			ret = vfs_parse_fs_string(fc, key, value, v_len);  in generic_parse_monolithic()
254 	struct fs_context *fc;  in alloc_fs_context()  local
257 	fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL_ACCOUNT);  in alloc_fs_context()
258 	if (!fc)  in alloc_fs_context()
261 	fc->purpose	= purpose;  in alloc_fs_context()
262 	fc->sb_flags	= sb_flags;  in alloc_fs_context()
263 	fc->sb_flags_mask = sb_flags_mask;  in alloc_fs_context()
264 	fc->fs_type	= get_filesystem(fs_type);  in alloc_fs_context()
265 	fc->cred	= get_current_cred();  in alloc_fs_context()
266 	fc->net_ns	= get_net(current->nsproxy->net_ns);  in alloc_fs_context()
267 	fc->log.prefix	= fs_type->name;  in alloc_fs_context()
269 	mutex_init(&fc->uapi_mutex);  in alloc_fs_context()
273 		fc->user_ns = get_user_ns(fc->cred->user_ns);  in alloc_fs_context()
276 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
280 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
281 		fc->root = dget(reference);  in alloc_fs_context()
286 	init_fs_context = fc->fs_type->init_fs_context;  in alloc_fs_context()
290 	ret = init_fs_context(fc);  in alloc_fs_context()
293 	fc->need_free = true;  in alloc_fs_context()
294 	return fc;  in alloc_fs_context()
297 	put_fs_context(fc);  in alloc_fs_context()
325 void fc_drop_locked(struct fs_context *fc)  in fc_drop_locked()  argument
327 	struct super_block *sb = fc->root->d_sb;  in fc_drop_locked()
328 	dput(fc->root);  in fc_drop_locked()
329 	fc->root = NULL;  in fc_drop_locked()
333 static void legacy_fs_context_free(struct fs_context *fc);
341 	struct fs_context *fc;  in vfs_dup_fs_context()  local
347 	fc = kmemdup(src_fc, sizeof(struct fs_context), GFP_KERNEL);  in vfs_dup_fs_context()
348 	if (!fc)  in vfs_dup_fs_context()
351 	mutex_init(&fc->uapi_mutex);  in vfs_dup_fs_context()
353 	fc->fs_private	= NULL;  in vfs_dup_fs_context()
354 	fc->s_fs_info	= NULL;  in vfs_dup_fs_context()
355 	fc->source	= NULL;  in vfs_dup_fs_context()
356 	fc->security	= NULL;  in vfs_dup_fs_context()
357 	get_filesystem(fc->fs_type);  in vfs_dup_fs_context()
358 	get_net(fc->net_ns);  in vfs_dup_fs_context()
359 	get_user_ns(fc->user_ns);  in vfs_dup_fs_context()
360 	get_cred(fc->cred);  in vfs_dup_fs_context()
361 	if (fc->log.log)  in vfs_dup_fs_context()
362 		refcount_inc(&fc->log.log->usage);  in vfs_dup_fs_context()
365 	ret = fc->ops->dup(fc, src_fc);  in vfs_dup_fs_context()
369 	ret = security_fs_context_dup(fc, src_fc);  in vfs_dup_fs_context()
372 	return fc;  in vfs_dup_fs_context()
375 	put_fs_context(fc);  in vfs_dup_fs_context()
437 static void put_fc_log(struct fs_context *fc)  in put_fc_log()  argument
439 	struct fc_log *log = fc->log.log;  in put_fc_log()
444 			fc->log.log = NULL;  in put_fc_log()
457 void put_fs_context(struct fs_context *fc)  in put_fs_context()  argument
461 	if (fc->root) {  in put_fs_context()
462 		sb = fc->root->d_sb;  in put_fs_context()
463 		dput(fc->root);  in put_fs_context()
464 		fc->root = NULL;  in put_fs_context()
468 	if (fc->need_free && fc->ops && fc->ops->free)  in put_fs_context()
469 		fc->ops->free(fc);  in put_fs_context()
471 	security_free_mnt_opts(&fc->security);  in put_fs_context()
472 	put_net(fc->net_ns);  in put_fs_context()
473 	put_user_ns(fc->user_ns);  in put_fs_context()
474 	put_cred(fc->cred);  in put_fs_context()
475 	put_fc_log(fc);  in put_fs_context()
476 	put_filesystem(fc->fs_type);  in put_fs_context()
477 	kfree(fc->source);  in put_fs_context()
478 	kfree(fc);  in put_fs_context()
485 static void legacy_fs_context_free(struct fs_context *fc)  in legacy_fs_context_free()  argument
487 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_fs_context_free()
499 static int legacy_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)  in legacy_fs_context_dup()  argument
517 	fc->fs_private = ctx;  in legacy_fs_context_dup()
525 static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)  in legacy_parse_param()  argument
527 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_param()
532 	ret = vfs_parse_fs_param_source(fc, param);  in legacy_parse_param()
537 		return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options");  in legacy_parse_param()
547 		return invalf(fc, "VFS: Legacy: Parameter type for '%s' not supported",  in legacy_parse_param()
552 		return invalf(fc, "VFS: Legacy: Cumulative options too large");  in legacy_parse_param()
556 		return invalf(fc, "VFS: Legacy: Option '%s' contained comma",  in legacy_parse_param()
582 static int legacy_parse_monolithic(struct fs_context *fc, void *data)  in legacy_parse_monolithic()  argument
584 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_monolithic()
596 	if (fc->fs_type->fs_flags & FS_BINARY_MOUNTDATA)  in legacy_parse_monolithic()
598 	return security_sb_eat_lsm_opts(ctx->legacy_data, &fc->security);  in legacy_parse_monolithic()
604 static int legacy_get_tree(struct fs_context *fc)  in legacy_get_tree()  argument
606 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_get_tree()
610 	root = fc->fs_type->mount(fc->fs_type, fc->sb_flags,  in legacy_get_tree()
611 				      fc->source, ctx->legacy_data);  in legacy_get_tree()
618 	fc->root = root;  in legacy_get_tree()
625 static int legacy_reconfigure(struct fs_context *fc)  in legacy_reconfigure()  argument
627 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_reconfigure()
628 	struct super_block *sb = fc->root->d_sb;  in legacy_reconfigure()
633 	return sb->s_op->remount_fs(sb, &fc->sb_flags,  in legacy_reconfigure()
650 static int legacy_init_fs_context(struct fs_context *fc)  in legacy_init_fs_context()  argument
652 	fc->fs_private = kzalloc(sizeof(struct legacy_fs_context), GFP_KERNEL_ACCOUNT);  in legacy_init_fs_context()
653 	if (!fc->fs_private)  in legacy_init_fs_context()
655 	fc->ops = &legacy_fs_context_ops;  in legacy_init_fs_context()
659 int parse_monolithic_mount_data(struct fs_context *fc, void *data)  in parse_monolithic_mount_data()  argument
663 	monolithic_mount_data = fc->ops->parse_monolithic;  in parse_monolithic_mount_data()
667 	return monolithic_mount_data(fc, data);  in parse_monolithic_mount_data()
683 void vfs_clean_context(struct fs_context *fc)  in vfs_clean_context()  argument
685 	if (fc->need_free && fc->ops && fc->ops->free)  in vfs_clean_context()
686 		fc->ops->free(fc);  in vfs_clean_context()
687 	fc->need_free = false;  in vfs_clean_context()
688 	fc->fs_private = NULL;  in vfs_clean_context()
689 	fc->s_fs_info = NULL;  in vfs_clean_context()
690 	fc->sb_flags = 0;  in vfs_clean_context()
691 	security_free_mnt_opts(&fc->security);  in vfs_clean_context()
692 	kfree(fc->source);  in vfs_clean_context()
693 	fc->source = NULL;  in vfs_clean_context()
695 	fc->purpose = FS_CONTEXT_FOR_RECONFIGURE;  in vfs_clean_context()
696 	fc->phase = FS_CONTEXT_AWAITING_RECONF;  in vfs_clean_context()
699 int finish_clean_context(struct fs_context *fc)  in finish_clean_context()  argument
703 	if (fc->phase != FS_CONTEXT_AWAITING_RECONF)  in finish_clean_context()
706 	if (fc->fs_type->init_fs_context)  in finish_clean_context()
707 		error = fc->fs_type->init_fs_context(fc);  in finish_clean_context()
709 		error = legacy_init_fs_context(fc);  in finish_clean_context()
711 		fc->phase = FS_CONTEXT_FAILED;  in finish_clean_context()
714 	fc->need_free = true;  in finish_clean_context()
715 	fc->phase = FS_CONTEXT_RECONF_PARAMS;  in finish_clean_context()