1 // SPDX-License-Identifier: GPL-2.0-or-later
46 	{ "sync",	SB_SYNCHRONOUS },
63 	unsigned int token;  in vfs_parse_sb_flag()  local
65 	token = lookup_constant(common_set_sb_flag, key, 0);  in vfs_parse_sb_flag()
66 	if (token) {  in vfs_parse_sb_flag()
67 		fc->sb_flags |= token;  in vfs_parse_sb_flag()
68 		fc->sb_flags_mask |= token;  in vfs_parse_sb_flag()
72 	token = lookup_constant(common_clear_sb_flag, key, 0);  in vfs_parse_sb_flag()
73 	if (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()
79 	return -ENOPARAM;  in vfs_parse_sb_flag()
83  * vfs_parse_fs_param_source - Handle setting "source" via parameter
90  * Returns 0 on success, -ENOPARAM if this is not  "source" parameter, and
91  * -EINVAL otherwise. In the event of failure, supplementary error information
96 	if (strcmp(param->key, "source") != 0)  in vfs_parse_fs_param_source()
97 		return -ENOPARAM;  in vfs_parse_fs_param_source()
99 	if (param->type != fs_value_is_string)  in vfs_parse_fs_param_source()
100 		return invalf(fc, "Non-string source");  in vfs_parse_fs_param_source()
102 	if (fc->source)  in vfs_parse_fs_param_source()
105 	fc->source = param->string;  in vfs_parse_fs_param_source()
106 	param->string = NULL;  in vfs_parse_fs_param_source()
112  * vfs_parse_fs_param - Add a single parameter to a superblock config
131 	if (!param->key)  in vfs_parse_fs_param()
134 	ret = vfs_parse_sb_flag(fc, param->key);  in vfs_parse_fs_param()
135 	if (ret != -ENOPARAM)  in vfs_parse_fs_param()
139 	if (ret != -ENOPARAM)  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()
147 		if (ret != -ENOPARAM)  in vfs_parse_fs_param()
155 	if (ret != -ENOPARAM)  in vfs_parse_fs_param()
159 		      fc->fs_type->name, param->key);  in vfs_parse_fs_param()
164  * vfs_parse_fs_string - Convenience function to just parse a string.
180 			return -ENOMEM;  in vfs_parse_fs_string()
191  * generic_parse_monolithic - Parse key[=val][,key[=val]]* mount data
196  * called from the ->monolithic_mount_data() fs_context operation.
198  * Returns 0 on success or the error returned by the ->parse_option() fs_context
209 	ret = security_sb_eat_lsm_opts(options, &fc->security);  in generic_parse_monolithic()
235  * alloc_fs_context - Create a filesystem context.
255 	int ret = -ENOMEM;  in alloc_fs_context()
259 		return ERR_PTR(-ENOMEM);  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()
279 		atomic_inc(&reference->d_sb->s_active);  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()
293 	fc->need_free = true;  in alloc_fs_context()
313 	return alloc_fs_context(dentry->d_sb->s_type, dentry, sb_flags,  in fs_context_for_reconfigure()
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()
344 	if (!src_fc->ops->dup)  in vfs_dup_fs_context()
345 		return ERR_PTR(-EOPNOTSUPP);  in vfs_dup_fs_context()
349 		return ERR_PTR(-ENOMEM);  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()
364 	/* Can't call put until we've called ->dup */  in vfs_dup_fs_context()
365 	ret = fc->ops->dup(fc, src_fc);  in vfs_dup_fs_context()
381  * logfc - Log a message to a filesystem context
407 		unsigned int logsize = ARRAY_SIZE(log->buffer);  in logfc()
413 		index = log->head & (logsize - 1);  in logfc()
414 		BUILD_BUG_ON(sizeof(log->head) != sizeof(u8) ||  in logfc()
415 			     sizeof(log->tail) != sizeof(u8));  in logfc()
416 		if ((u8)(log->head - log->tail) == logsize) {  in logfc()
418 			if (log->need_free & (1 << index))  in logfc()
419 				kfree(log->buffer[index]);  in logfc()
420 			log->tail++;  in logfc()
423 		log->buffer[index] = q ? q : "OOM: Can't store error string";  in logfc()
425 			log->need_free |= 1 << index;  in logfc()
427 			log->need_free &= ~(1 << index);  in logfc()
428 		log->head++;  in logfc()
439 	struct fc_log *log = fc->log.log;  in put_fc_log()
443 		if (refcount_dec_and_test(&log->usage)) {  in put_fc_log()
444 			fc->log.log = NULL;  in put_fc_log()
446 				if (log->need_free & (1 << i))  in put_fc_log()
447 					kfree(log->buffer[i]);  in put_fc_log()
454  * put_fs_context - Dispose of a superblock configuration context.
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()
476 	put_filesystem(fc->fs_type);  in put_fs_context()
477 	kfree(fc->source);  in put_fs_context()
487 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_fs_context_free()
490 		if (ctx->param_type == LEGACY_FS_INDIVIDUAL_PARAMS)  in legacy_fs_context_free()
491 			kfree(ctx->legacy_data);  in legacy_fs_context_free()
502 	struct legacy_fs_context *src_ctx = src_fc->fs_private;  in legacy_fs_context_dup()
506 		return -ENOMEM;  in legacy_fs_context_dup()
508 	if (ctx->param_type == LEGACY_FS_INDIVIDUAL_PARAMS) {  in legacy_fs_context_dup()
509 		ctx->legacy_data = kmemdup(src_ctx->legacy_data,  in legacy_fs_context_dup()
510 					   src_ctx->data_size, GFP_KERNEL);  in legacy_fs_context_dup()
511 		if (!ctx->legacy_data) {  in legacy_fs_context_dup()
513 			return -ENOMEM;  in legacy_fs_context_dup()
517 	fc->fs_private = ctx;  in legacy_fs_context_dup()
522  * Add a parameter to a legacy config.  We build up a comma-separated list of
527 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_param()
528 	unsigned int size = ctx->data_size;  in legacy_parse_param()
533 	if (ret != -ENOPARAM)  in legacy_parse_param()
536 	if (ctx->param_type == LEGACY_FS_MONOLITHIC_PARAMS)  in legacy_parse_param()
539 	switch (param->type) {  in legacy_parse_param()
541 		len = 1 + param->size;  in legacy_parse_param()
544 		len += strlen(param->key);  in legacy_parse_param()
548 			      param->key);  in legacy_parse_param()
553 	if (strchr(param->key, ',') ||  in legacy_parse_param()
554 	    (param->type == fs_value_is_string &&  in legacy_parse_param()
555 	     memchr(param->string, ',', param->size)))  in legacy_parse_param()
557 			      param->key);  in legacy_parse_param()
558 	if (!ctx->legacy_data) {  in legacy_parse_param()
559 		ctx->legacy_data = kmalloc(PAGE_SIZE, GFP_KERNEL);  in legacy_parse_param()
560 		if (!ctx->legacy_data)  in legacy_parse_param()
561 			return -ENOMEM;  in legacy_parse_param()
564 	ctx->legacy_data[size++] = ',';  in legacy_parse_param()
565 	len = strlen(param->key);  in legacy_parse_param()
566 	memcpy(ctx->legacy_data + size, param->key, len);  in legacy_parse_param()
568 	if (param->type == fs_value_is_string) {  in legacy_parse_param()
569 		ctx->legacy_data[size++] = '=';  in legacy_parse_param()
570 		memcpy(ctx->legacy_data + size, param->string, param->size);  in legacy_parse_param()
571 		size += param->size;  in legacy_parse_param()
573 	ctx->legacy_data[size] = '\0';  in legacy_parse_param()
574 	ctx->data_size = size;  in legacy_parse_param()
575 	ctx->param_type = LEGACY_FS_INDIVIDUAL_PARAMS;  in legacy_parse_param()
584 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_monolithic()
586 	if (ctx->param_type != LEGACY_FS_UNSET_PARAMS) {  in legacy_parse_monolithic()
588 		return -EINVAL;  in legacy_parse_monolithic()
591 	ctx->legacy_data = data;  in legacy_parse_monolithic()
592 	ctx->param_type = LEGACY_FS_MONOLITHIC_PARAMS;  in legacy_parse_monolithic()
593 	if (!ctx->legacy_data)  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()
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()
615 	sb = root->d_sb;  in legacy_get_tree()
618 	fc->root = root;  in legacy_get_tree()
627 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_reconfigure()
628 	struct super_block *sb = fc->root->d_sb;  in legacy_reconfigure()
630 	if (!sb->s_op->remount_fs)  in legacy_reconfigure()
633 	return sb->s_op->remount_fs(sb, &fc->sb_flags,  in legacy_reconfigure()
634 				    ctx ? ctx->legacy_data : NULL);  in legacy_reconfigure()
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()
654 		return -ENOMEM;  in legacy_init_fs_context()
655 	fc->ops = &legacy_fs_context_ops;  in legacy_init_fs_context()
663 	monolithic_mount_data = fc->ops->parse_monolithic;  in parse_monolithic_mount_data()
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()
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()
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()