39 static int legacy_init_fs_context(struct fs_context *fc);
84 static int vfs_parse_sb_flag(struct fs_context *fc, const char *key)  in vfs_parse_sb_flag()  argument
95 		fc->sb_flags |= token;  in vfs_parse_sb_flag()
96 		fc->sb_flags_mask |= token;  in vfs_parse_sb_flag()
102 		fc->sb_flags &= ~token;  in vfs_parse_sb_flag()
103 		fc->sb_flags_mask |= token;  in vfs_parse_sb_flag()
126 int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param)  in vfs_parse_fs_param()  argument
131 		return invalf(fc, "Unnamed parameter\n");  in vfs_parse_fs_param()
133 	ret = vfs_parse_sb_flag(fc, param->key);  in vfs_parse_fs_param()
137 	ret = security_fs_context_parse_param(fc, param);  in vfs_parse_fs_param()
144 	if (fc->ops->parse_param) {  in vfs_parse_fs_param()
145 		ret = fc->ops->parse_param(fc, param);  in vfs_parse_fs_param()
155 			return invalf(fc, "VFS: Non-string source");  in vfs_parse_fs_param()
156 		if (fc->source)  in vfs_parse_fs_param()
157 			return invalf(fc, "VFS: Multiple sources");  in vfs_parse_fs_param()
158 		fc->source = param->string;  in vfs_parse_fs_param()
163 	return invalf(fc, "%s: Unknown parameter '%s'",  in vfs_parse_fs_param()
164 		      fc->fs_type->name, param->key);  in vfs_parse_fs_param()
171 int vfs_parse_fs_string(struct fs_context *fc, const char *key,  in vfs_parse_fs_string()  argument
188 	ret = vfs_parse_fs_param(fc, &param);  in vfs_parse_fs_string()
205 int generic_parse_monolithic(struct fs_context *fc, void *data)  in generic_parse_monolithic()  argument
213 	ret = security_sb_eat_lsm_opts(options, &fc->security);  in generic_parse_monolithic()
228 			ret = vfs_parse_fs_string(fc, key, value, v_len);  in generic_parse_monolithic()
258 	struct fs_context *fc;  in alloc_fs_context()  local
261 	fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL);  in alloc_fs_context()
262 	if (!fc)  in alloc_fs_context()
265 	fc->purpose	= purpose;  in alloc_fs_context()
266 	fc->sb_flags	= sb_flags;  in alloc_fs_context()
267 	fc->sb_flags_mask = sb_flags_mask;  in alloc_fs_context()
268 	fc->fs_type	= get_filesystem(fs_type);  in alloc_fs_context()
269 	fc->cred	= get_current_cred();  in alloc_fs_context()
270 	fc->net_ns	= get_net(current->nsproxy->net_ns);  in alloc_fs_context()
272 	mutex_init(&fc->uapi_mutex);  in alloc_fs_context()
276 		fc->user_ns = get_user_ns(fc->cred->user_ns);  in alloc_fs_context()
279 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
283 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
284 		fc->root = dget(reference);  in alloc_fs_context()
289 	init_fs_context = fc->fs_type->init_fs_context;  in alloc_fs_context()
293 	ret = init_fs_context(fc);  in alloc_fs_context()
296 	fc->need_free = true;  in alloc_fs_context()
297 	return fc;  in alloc_fs_context()
300 	put_fs_context(fc);  in alloc_fs_context()
328 void fc_drop_locked(struct fs_context *fc)  in fc_drop_locked()  argument
330 	struct super_block *sb = fc->root->d_sb;  in fc_drop_locked()
331 	dput(fc->root);  in fc_drop_locked()
332 	fc->root = NULL;  in fc_drop_locked()
336 static void legacy_fs_context_free(struct fs_context *fc);
344 	struct fs_context *fc;  in vfs_dup_fs_context()  local
350 	fc = kmemdup(src_fc, sizeof(struct fs_context), GFP_KERNEL);  in vfs_dup_fs_context()
351 	if (!fc)  in vfs_dup_fs_context()
354 	mutex_init(&fc->uapi_mutex);  in vfs_dup_fs_context()
356 	fc->fs_private	= NULL;  in vfs_dup_fs_context()
357 	fc->s_fs_info	= NULL;  in vfs_dup_fs_context()
358 	fc->source	= NULL;  in vfs_dup_fs_context()
359 	fc->security	= NULL;  in vfs_dup_fs_context()
360 	get_filesystem(fc->fs_type);  in vfs_dup_fs_context()
361 	get_net(fc->net_ns);  in vfs_dup_fs_context()
362 	get_user_ns(fc->user_ns);  in vfs_dup_fs_context()
363 	get_cred(fc->cred);  in vfs_dup_fs_context()
364 	if (fc->log)  in vfs_dup_fs_context()
365 		refcount_inc(&fc->log->usage);  in vfs_dup_fs_context()
368 	ret = fc->ops->dup(fc, src_fc);  in vfs_dup_fs_context()
372 	ret = security_fs_context_dup(fc, src_fc);  in vfs_dup_fs_context()
375 	return fc;  in vfs_dup_fs_context()
378 	put_fs_context(fc);  in vfs_dup_fs_context()
388 void logfc(struct fs_context *fc, const char *fmt, ...)  in logfc()  argument
391 	struct fc_log *log = fc ? fc->log : NULL;  in logfc()
469 static void put_fc_log(struct fs_context *fc)  in put_fc_log()  argument
471 	struct fc_log *log = fc->log;  in put_fc_log()
476 			fc->log = NULL;  in put_fc_log()
489 void put_fs_context(struct fs_context *fc)  in put_fs_context()  argument
493 	if (fc->root) {  in put_fs_context()
494 		sb = fc->root->d_sb;  in put_fs_context()
495 		dput(fc->root);  in put_fs_context()
496 		fc->root = NULL;  in put_fs_context()
500 	if (fc->need_free && fc->ops && fc->ops->free)  in put_fs_context()
501 		fc->ops->free(fc);  in put_fs_context()
503 	security_free_mnt_opts(&fc->security);  in put_fs_context()
504 	put_net(fc->net_ns);  in put_fs_context()
505 	put_user_ns(fc->user_ns);  in put_fs_context()
506 	put_cred(fc->cred);  in put_fs_context()
507 	put_fc_log(fc);  in put_fs_context()
508 	put_filesystem(fc->fs_type);  in put_fs_context()
509 	kfree(fc->source);  in put_fs_context()
510 	kfree(fc);  in put_fs_context()
517 static void legacy_fs_context_free(struct fs_context *fc)  in legacy_fs_context_free()  argument
519 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_fs_context_free()
531 static int legacy_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)  in legacy_fs_context_dup()  argument
549 	fc->fs_private = ctx;  in legacy_fs_context_dup()
557 static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)  in legacy_parse_param()  argument
559 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_param()
565 			return invalf(fc, "VFS: Legacy: Non-string source");  in legacy_parse_param()
566 		if (fc->source)  in legacy_parse_param()
567 			return invalf(fc, "VFS: Legacy: Multiple sources");  in legacy_parse_param()
568 		fc->source = param->string;  in legacy_parse_param()
574 		return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options");  in legacy_parse_param()
584 		return invalf(fc, "VFS: Legacy: Parameter type for '%s' not supported",  in legacy_parse_param()
589 		return invalf(fc, "VFS: Legacy: Cumulative options too large");  in legacy_parse_param()
593 		return invalf(fc, "VFS: Legacy: Option '%s' contained comma",  in legacy_parse_param()
619 static int legacy_parse_monolithic(struct fs_context *fc, void *data)  in legacy_parse_monolithic()  argument
621 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_monolithic()
633 	if (fc->fs_type->fs_flags & FS_BINARY_MOUNTDATA)  in legacy_parse_monolithic()
635 	return security_sb_eat_lsm_opts(ctx->legacy_data, &fc->security);  in legacy_parse_monolithic()
641 static int legacy_get_tree(struct fs_context *fc)  in legacy_get_tree()  argument
643 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_get_tree()
647 	root = fc->fs_type->mount(fc->fs_type, fc->sb_flags,  in legacy_get_tree()
648 				      fc->source, ctx->legacy_data);  in legacy_get_tree()
655 	fc->root = root;  in legacy_get_tree()
662 static int legacy_reconfigure(struct fs_context *fc)  in legacy_reconfigure()  argument
664 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_reconfigure()
665 	struct super_block *sb = fc->root->d_sb;  in legacy_reconfigure()
670 	return sb->s_op->remount_fs(sb, &fc->sb_flags,  in legacy_reconfigure()
687 static int legacy_init_fs_context(struct fs_context *fc)  in legacy_init_fs_context()  argument
689 	fc->fs_private = kzalloc(sizeof(struct legacy_fs_context), GFP_KERNEL);  in legacy_init_fs_context()
690 	if (!fc->fs_private)  in legacy_init_fs_context()
692 	fc->ops = &legacy_fs_context_ops;  in legacy_init_fs_context()
696 int parse_monolithic_mount_data(struct fs_context *fc, void *data)  in parse_monolithic_mount_data()  argument
700 	monolithic_mount_data = fc->ops->parse_monolithic;  in parse_monolithic_mount_data()
704 	return monolithic_mount_data(fc, data);  in parse_monolithic_mount_data()
720 void vfs_clean_context(struct fs_context *fc)  in vfs_clean_context()  argument
722 	if (fc->need_free && fc->ops && fc->ops->free)  in vfs_clean_context()
723 		fc->ops->free(fc);  in vfs_clean_context()
724 	fc->need_free = false;  in vfs_clean_context()
725 	fc->fs_private = NULL;  in vfs_clean_context()
726 	fc->s_fs_info = NULL;  in vfs_clean_context()
727 	fc->sb_flags = 0;  in vfs_clean_context()
728 	security_free_mnt_opts(&fc->security);  in vfs_clean_context()
729 	kfree(fc->source);  in vfs_clean_context()
730 	fc->source = NULL;  in vfs_clean_context()
732 	fc->purpose = FS_CONTEXT_FOR_RECONFIGURE;  in vfs_clean_context()
733 	fc->phase = FS_CONTEXT_AWAITING_RECONF;  in vfs_clean_context()
736 int finish_clean_context(struct fs_context *fc)  in finish_clean_context()  argument
740 	if (fc->phase != FS_CONTEXT_AWAITING_RECONF)  in finish_clean_context()
743 	if (fc->fs_type->init_fs_context)  in finish_clean_context()
744 		error = fc->fs_type->init_fs_context(fc);  in finish_clean_context()
746 		error = legacy_init_fs_context(fc);  in finish_clean_context()
748 		fc->phase = FS_CONTEXT_FAILED;  in finish_clean_context()
751 	fc->need_free = true;  in finish_clean_context()
752 	fc->phase = FS_CONTEXT_RECONF_PARAMS;  in finish_clean_context()