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()
169 int vfs_parse_fs_qstr(struct fs_context *fc, const char *key,  in vfs_parse_fs_qstr()  argument
187 	ret = vfs_parse_fs_param(fc, &param);  in vfs_parse_fs_qstr()
205 int vfs_parse_monolithic_sep(struct fs_context *fc, void *data,  in vfs_parse_monolithic_sep()  argument
214 	ret = security_sb_eat_lsm_opts(options, &fc->security);  in vfs_parse_monolithic_sep()
227 			ret = vfs_parse_fs_string(fc, key, value);  in vfs_parse_monolithic_sep()
253 int generic_parse_monolithic(struct fs_context *fc, void *data)  in generic_parse_monolithic()  argument
255 	return vfs_parse_monolithic_sep(fc, data, vfs_parse_comma_sep);  in generic_parse_monolithic()
279 	struct fs_context *fc;  in alloc_fs_context()  local
282 	fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL_ACCOUNT);  in alloc_fs_context()
283 	if (!fc)  in alloc_fs_context()
286 	fc->purpose	= purpose;  in alloc_fs_context()
287 	fc->sb_flags	= sb_flags;  in alloc_fs_context()
288 	fc->sb_flags_mask = sb_flags_mask;  in alloc_fs_context()
289 	fc->fs_type	= get_filesystem(fs_type);  in alloc_fs_context()
290 	fc->cred	= get_current_cred();  in alloc_fs_context()
291 	fc->net_ns	= get_net(current->nsproxy->net_ns);  in alloc_fs_context()
292 	fc->log.prefix	= fs_type->name;  in alloc_fs_context()
294 	mutex_init(&fc->uapi_mutex);  in alloc_fs_context()
298 		fc->user_ns = get_user_ns(fc->cred->user_ns);  in alloc_fs_context()
301 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
305 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
306 		fc->root = dget(reference);  in alloc_fs_context()
311 	init_fs_context = fc->fs_type->init_fs_context;  in alloc_fs_context()
315 	ret = init_fs_context(fc);  in alloc_fs_context()
318 	fc->need_free = true;  in alloc_fs_context()
319 	return fc;  in alloc_fs_context()
322 	put_fs_context(fc);  in alloc_fs_context()
354 	struct fs_context *fc;  in fs_context_for_submount()  local
357 	fc = alloc_fs_context(type, reference, 0, 0, FS_CONTEXT_FOR_SUBMOUNT);  in fs_context_for_submount()
358 	if (IS_ERR(fc))  in fs_context_for_submount()
359 		return fc;  in fs_context_for_submount()
361 	ret = security_fs_context_submount(fc, reference->d_sb);  in fs_context_for_submount()
363 		put_fs_context(fc);  in fs_context_for_submount()
367 	return fc;  in fs_context_for_submount()
371 void fc_drop_locked(struct fs_context *fc)  in fc_drop_locked()  argument
373 	struct super_block *sb = fc->root->d_sb;  in fc_drop_locked()
374 	dput(fc->root);  in fc_drop_locked()
375 	fc->root = NULL;  in fc_drop_locked()
379 static void legacy_fs_context_free(struct fs_context *fc);
387 	struct fs_context *fc;  in vfs_dup_fs_context()  local
393 	fc = kmemdup(src_fc, sizeof(struct fs_context), GFP_KERNEL);  in vfs_dup_fs_context()
394 	if (!fc)  in vfs_dup_fs_context()
397 	mutex_init(&fc->uapi_mutex);  in vfs_dup_fs_context()
399 	fc->fs_private	= NULL;  in vfs_dup_fs_context()
400 	fc->s_fs_info	= NULL;  in vfs_dup_fs_context()
401 	fc->source	= NULL;  in vfs_dup_fs_context()
402 	fc->security	= NULL;  in vfs_dup_fs_context()
403 	get_filesystem(fc->fs_type);  in vfs_dup_fs_context()
404 	get_net(fc->net_ns);  in vfs_dup_fs_context()
405 	get_user_ns(fc->user_ns);  in vfs_dup_fs_context()
406 	get_cred(fc->cred);  in vfs_dup_fs_context()
407 	if (fc->log.log)  in vfs_dup_fs_context()
408 		refcount_inc(&fc->log.log->usage);  in vfs_dup_fs_context()
411 	ret = fc->ops->dup(fc, src_fc);  in vfs_dup_fs_context()
415 	ret = security_fs_context_dup(fc, src_fc);  in vfs_dup_fs_context()
418 	return fc;  in vfs_dup_fs_context()
421 	put_fs_context(fc);  in vfs_dup_fs_context()
489 static void put_fc_log(struct fs_context *fc)  in put_fc_log()  argument
491 	struct fc_log *log = fc->log.log;  in put_fc_log()
496 			fc->log.log = NULL;  in put_fc_log()
509 void put_fs_context(struct fs_context *fc)  in put_fs_context()  argument
513 	if (fc->root) {  in put_fs_context()
514 		sb = fc->root->d_sb;  in put_fs_context()
515 		dput(fc->root);  in put_fs_context()
516 		fc->root = NULL;  in put_fs_context()
520 	if (fc->need_free && fc->ops && fc->ops->free)  in put_fs_context()
521 		fc->ops->free(fc);  in put_fs_context()
523 	security_free_mnt_opts(&fc->security);  in put_fs_context()
524 	put_net(fc->net_ns);  in put_fs_context()
525 	put_user_ns(fc->user_ns);  in put_fs_context()
526 	put_cred(fc->cred);  in put_fs_context()
527 	put_fc_log(fc);  in put_fs_context()
528 	put_filesystem(fc->fs_type);  in put_fs_context()
529 	kfree(fc->source);  in put_fs_context()
530 	kfree(fc);  in put_fs_context()
537 static void legacy_fs_context_free(struct fs_context *fc)  in legacy_fs_context_free()  argument
539 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_fs_context_free()
551 static int legacy_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)  in legacy_fs_context_dup()  argument
569 	fc->fs_private = ctx;  in legacy_fs_context_dup()
577 static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)  in legacy_parse_param()  argument
579 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_param()
584 	ret = vfs_parse_fs_param_source(fc, param);  in legacy_parse_param()
589 		return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options");  in legacy_parse_param()
599 		return invalf(fc, "VFS: Legacy: Parameter type for '%s' not supported",  in legacy_parse_param()
604 		return invalf(fc, "VFS: Legacy: Cumulative options too large");  in legacy_parse_param()
608 		return invalf(fc, "VFS: Legacy: Option '%s' contained comma",  in legacy_parse_param()
635 static int legacy_parse_monolithic(struct fs_context *fc, void *data)  in legacy_parse_monolithic()  argument
637 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_monolithic()
649 	if (fc->fs_type->fs_flags & FS_BINARY_MOUNTDATA)  in legacy_parse_monolithic()
651 	return security_sb_eat_lsm_opts(ctx->legacy_data, &fc->security);  in legacy_parse_monolithic()
657 static int legacy_get_tree(struct fs_context *fc)  in legacy_get_tree()  argument
659 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_get_tree()
663 	root = fc->fs_type->mount(fc->fs_type, fc->sb_flags,  in legacy_get_tree()
664 				      fc->source, ctx->legacy_data);  in legacy_get_tree()
671 	fc->root = root;  in legacy_get_tree()
678 static int legacy_reconfigure(struct fs_context *fc)  in legacy_reconfigure()  argument
680 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_reconfigure()
681 	struct super_block *sb = fc->root->d_sb;  in legacy_reconfigure()
686 	return sb->s_op->remount_fs(sb, &fc->sb_flags,  in legacy_reconfigure()
703 static int legacy_init_fs_context(struct fs_context *fc)  in legacy_init_fs_context()  argument
705 	fc->fs_private = kzalloc(sizeof(struct legacy_fs_context), GFP_KERNEL_ACCOUNT);  in legacy_init_fs_context()
706 	if (!fc->fs_private)  in legacy_init_fs_context()
708 	fc->ops = &legacy_fs_context_ops;  in legacy_init_fs_context()
712 int parse_monolithic_mount_data(struct fs_context *fc, void *data)  in parse_monolithic_mount_data()  argument
716 	monolithic_mount_data = fc->ops->parse_monolithic;  in parse_monolithic_mount_data()
720 	return monolithic_mount_data(fc, data);  in parse_monolithic_mount_data()
736 void vfs_clean_context(struct fs_context *fc)  in vfs_clean_context()  argument
738 	if (fc->need_free && fc->ops && fc->ops->free)  in vfs_clean_context()
739 		fc->ops->free(fc);  in vfs_clean_context()
740 	fc->need_free = false;  in vfs_clean_context()
741 	fc->fs_private = NULL;  in vfs_clean_context()
742 	fc->s_fs_info = NULL;  in vfs_clean_context()
743 	fc->sb_flags = 0;  in vfs_clean_context()
744 	security_free_mnt_opts(&fc->security);  in vfs_clean_context()
745 	kfree(fc->source);  in vfs_clean_context()
746 	fc->source = NULL;  in vfs_clean_context()
747 	fc->exclusive = false;  in vfs_clean_context()
749 	fc->purpose = FS_CONTEXT_FOR_RECONFIGURE;  in vfs_clean_context()
750 	fc->phase = FS_CONTEXT_AWAITING_RECONF;  in vfs_clean_context()
753 int finish_clean_context(struct fs_context *fc)  in finish_clean_context()  argument
757 	if (fc->phase != FS_CONTEXT_AWAITING_RECONF)  in finish_clean_context()
760 	if (fc->fs_type->init_fs_context)  in finish_clean_context()
761 		error = fc->fs_type->init_fs_context(fc);  in finish_clean_context()
763 		error = legacy_init_fs_context(fc);  in finish_clean_context()
765 		fc->phase = FS_CONTEXT_FAILED;  in finish_clean_context()
768 	fc->need_free = true;  in finish_clean_context()
769 	fc->phase = FS_CONTEXT_RECONF_PARAMS;  in finish_clean_context()