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()
98 int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param)  in vfs_parse_fs_param()  argument
103 		return invalf(fc, "Unnamed parameter\n");  in vfs_parse_fs_param()
105 	ret = vfs_parse_sb_flag(fc, param->key);  in vfs_parse_fs_param()
109 	ret = security_fs_context_parse_param(fc, param);  in vfs_parse_fs_param()
116 	if (fc->ops->parse_param) {  in vfs_parse_fs_param()
117 		ret = fc->ops->parse_param(fc, param);  in vfs_parse_fs_param()
127 			return invalf(fc, "VFS: Non-string source");  in vfs_parse_fs_param()
128 		if (fc->source)  in vfs_parse_fs_param()
129 			return invalf(fc, "VFS: Multiple sources");  in vfs_parse_fs_param()
130 		fc->source = param->string;  in vfs_parse_fs_param()
135 	return invalf(fc, "%s: Unknown parameter '%s'",  in vfs_parse_fs_param()
136 		      fc->fs_type->name, param->key);  in vfs_parse_fs_param()
143 int vfs_parse_fs_string(struct fs_context *fc, const char *key,  in vfs_parse_fs_string()  argument
161 	ret = vfs_parse_fs_param(fc, &param);  in vfs_parse_fs_string()
178 int generic_parse_monolithic(struct fs_context *fc, void *data)  in generic_parse_monolithic()  argument
186 	ret = security_sb_eat_lsm_opts(options, &fc->security);  in generic_parse_monolithic()
201 			ret = vfs_parse_fs_string(fc, key, value, v_len);  in generic_parse_monolithic()
231 	struct fs_context *fc;  in alloc_fs_context()  local
234 	fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL_ACCOUNT);  in alloc_fs_context()
235 	if (!fc)  in alloc_fs_context()
238 	fc->purpose	= purpose;  in alloc_fs_context()
239 	fc->sb_flags	= sb_flags;  in alloc_fs_context()
240 	fc->sb_flags_mask = sb_flags_mask;  in alloc_fs_context()
241 	fc->fs_type	= get_filesystem(fs_type);  in alloc_fs_context()
242 	fc->cred	= get_current_cred();  in alloc_fs_context()
243 	fc->net_ns	= get_net(current->nsproxy->net_ns);  in alloc_fs_context()
244 	fc->log.prefix	= fs_type->name;  in alloc_fs_context()
246 	mutex_init(&fc->uapi_mutex);  in alloc_fs_context()
250 		fc->user_ns = get_user_ns(fc->cred->user_ns);  in alloc_fs_context()
253 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
257 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
258 		fc->root = dget(reference);  in alloc_fs_context()
263 	init_fs_context = fc->fs_type->init_fs_context;  in alloc_fs_context()
267 	ret = init_fs_context(fc);  in alloc_fs_context()
270 	fc->need_free = true;  in alloc_fs_context()
271 	return fc;  in alloc_fs_context()
274 	put_fs_context(fc);  in alloc_fs_context()
302 void fc_drop_locked(struct fs_context *fc)  in fc_drop_locked()  argument
304 	struct super_block *sb = fc->root->d_sb;  in fc_drop_locked()
305 	dput(fc->root);  in fc_drop_locked()
306 	fc->root = NULL;  in fc_drop_locked()
310 static void legacy_fs_context_free(struct fs_context *fc);
318 	struct fs_context *fc;  in vfs_dup_fs_context()  local
324 	fc = kmemdup(src_fc, sizeof(struct fs_context), GFP_KERNEL);  in vfs_dup_fs_context()
325 	if (!fc)  in vfs_dup_fs_context()
328 	mutex_init(&fc->uapi_mutex);  in vfs_dup_fs_context()
330 	fc->fs_private	= NULL;  in vfs_dup_fs_context()
331 	fc->s_fs_info	= NULL;  in vfs_dup_fs_context()
332 	fc->source	= NULL;  in vfs_dup_fs_context()
333 	fc->security	= NULL;  in vfs_dup_fs_context()
334 	get_filesystem(fc->fs_type);  in vfs_dup_fs_context()
335 	get_net(fc->net_ns);  in vfs_dup_fs_context()
336 	get_user_ns(fc->user_ns);  in vfs_dup_fs_context()
337 	get_cred(fc->cred);  in vfs_dup_fs_context()
338 	if (fc->log.log)  in vfs_dup_fs_context()
339 		refcount_inc(&fc->log.log->usage);  in vfs_dup_fs_context()
342 	ret = fc->ops->dup(fc, src_fc);  in vfs_dup_fs_context()
346 	ret = security_fs_context_dup(fc, src_fc);  in vfs_dup_fs_context()
349 	return fc;  in vfs_dup_fs_context()
352 	put_fs_context(fc);  in vfs_dup_fs_context()
414 static void put_fc_log(struct fs_context *fc)  in put_fc_log()  argument
416 	struct fc_log *log = fc->log.log;  in put_fc_log()
421 			fc->log.log = NULL;  in put_fc_log()
434 void put_fs_context(struct fs_context *fc)  in put_fs_context()  argument
438 	if (fc->root) {  in put_fs_context()
439 		sb = fc->root->d_sb;  in put_fs_context()
440 		dput(fc->root);  in put_fs_context()
441 		fc->root = NULL;  in put_fs_context()
445 	if (fc->need_free && fc->ops && fc->ops->free)  in put_fs_context()
446 		fc->ops->free(fc);  in put_fs_context()
448 	security_free_mnt_opts(&fc->security);  in put_fs_context()
449 	put_net(fc->net_ns);  in put_fs_context()
450 	put_user_ns(fc->user_ns);  in put_fs_context()
451 	put_cred(fc->cred);  in put_fs_context()
452 	put_fc_log(fc);  in put_fs_context()
453 	put_filesystem(fc->fs_type);  in put_fs_context()
454 	kfree(fc->source);  in put_fs_context()
455 	kfree(fc);  in put_fs_context()
462 static void legacy_fs_context_free(struct fs_context *fc)  in legacy_fs_context_free()  argument
464 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_fs_context_free()
476 static int legacy_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)  in legacy_fs_context_dup()  argument
494 	fc->fs_private = ctx;  in legacy_fs_context_dup()
502 static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)  in legacy_parse_param()  argument
504 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_param()
510 			return invalf(fc, "VFS: Legacy: Non-string source");  in legacy_parse_param()
511 		if (fc->source)  in legacy_parse_param()
512 			return invalf(fc, "VFS: Legacy: Multiple sources");  in legacy_parse_param()
513 		fc->source = param->string;  in legacy_parse_param()
519 		return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options");  in legacy_parse_param()
529 		return invalf(fc, "VFS: Legacy: Parameter type for '%s' not supported",  in legacy_parse_param()
534 		return invalf(fc, "VFS: Legacy: Cumulative options too large");  in legacy_parse_param()
538 		return invalf(fc, "VFS: Legacy: Option '%s' contained comma",  in legacy_parse_param()
564 static int legacy_parse_monolithic(struct fs_context *fc, void *data)  in legacy_parse_monolithic()  argument
566 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_monolithic()
578 	if (fc->fs_type->fs_flags & FS_BINARY_MOUNTDATA)  in legacy_parse_monolithic()
580 	return security_sb_eat_lsm_opts(ctx->legacy_data, &fc->security);  in legacy_parse_monolithic()
586 static int legacy_get_tree(struct fs_context *fc)  in legacy_get_tree()  argument
588 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_get_tree()
592 	root = fc->fs_type->mount(fc->fs_type, fc->sb_flags,  in legacy_get_tree()
593 				      fc->source, ctx->legacy_data);  in legacy_get_tree()
600 	fc->root = root;  in legacy_get_tree()
607 static int legacy_reconfigure(struct fs_context *fc)  in legacy_reconfigure()  argument
609 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_reconfigure()
610 	struct super_block *sb = fc->root->d_sb;  in legacy_reconfigure()
615 	return sb->s_op->remount_fs(sb, &fc->sb_flags,  in legacy_reconfigure()
632 static int legacy_init_fs_context(struct fs_context *fc)  in legacy_init_fs_context()  argument
634 	fc->fs_private = kzalloc(sizeof(struct legacy_fs_context), GFP_KERNEL_ACCOUNT);  in legacy_init_fs_context()
635 	if (!fc->fs_private)  in legacy_init_fs_context()
637 	fc->ops = &legacy_fs_context_ops;  in legacy_init_fs_context()
641 int parse_monolithic_mount_data(struct fs_context *fc, void *data)  in parse_monolithic_mount_data()  argument
645 	monolithic_mount_data = fc->ops->parse_monolithic;  in parse_monolithic_mount_data()
649 	return monolithic_mount_data(fc, data);  in parse_monolithic_mount_data()
665 void vfs_clean_context(struct fs_context *fc)  in vfs_clean_context()  argument
667 	if (fc->need_free && fc->ops && fc->ops->free)  in vfs_clean_context()
668 		fc->ops->free(fc);  in vfs_clean_context()
669 	fc->need_free = false;  in vfs_clean_context()
670 	fc->fs_private = NULL;  in vfs_clean_context()
671 	fc->s_fs_info = NULL;  in vfs_clean_context()
672 	fc->sb_flags = 0;  in vfs_clean_context()
673 	security_free_mnt_opts(&fc->security);  in vfs_clean_context()
674 	kfree(fc->source);  in vfs_clean_context()
675 	fc->source = NULL;  in vfs_clean_context()
677 	fc->purpose = FS_CONTEXT_FOR_RECONFIGURE;  in vfs_clean_context()
678 	fc->phase = FS_CONTEXT_AWAITING_RECONF;  in vfs_clean_context()
681 int finish_clean_context(struct fs_context *fc)  in finish_clean_context()  argument
685 	if (fc->phase != FS_CONTEXT_AWAITING_RECONF)  in finish_clean_context()
688 	if (fc->fs_type->init_fs_context)  in finish_clean_context()
689 		error = fc->fs_type->init_fs_context(fc);  in finish_clean_context()
691 		error = legacy_init_fs_context(fc);  in finish_clean_context()
693 		fc->phase = FS_CONTEXT_FAILED;  in finish_clean_context()
696 	fc->need_free = true;  in finish_clean_context()
697 	fc->phase = FS_CONTEXT_RECONF_PARAMS;  in finish_clean_context()