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()
84  * @fc: The filesystem context to modify
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()
113  * @fc: The filesystem context to modify
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()
165  * @fc: Filesystem context.
170 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()
196  * @fc: The superblock configuration to fill in.
206 int vfs_parse_monolithic_sep(struct fs_context *fc, void *data,  in vfs_parse_monolithic_sep()  argument
215 	ret = security_sb_eat_lsm_opts(options, &fc->security);  in vfs_parse_monolithic_sep()
230 			ret = vfs_parse_fs_string(fc, key, value, v_len);  in vfs_parse_monolithic_sep()
247  * @fc: The superblock configuration to fill in.
256 int generic_parse_monolithic(struct fs_context *fc, void *data)  in generic_parse_monolithic()  argument
258 	return vfs_parse_monolithic_sep(fc, data, vfs_parse_comma_sep);  in generic_parse_monolithic()
282 	struct fs_context *fc;  in alloc_fs_context()  local
285 	fc = kzalloc(sizeof(struct fs_context), GFP_KERNEL_ACCOUNT);  in alloc_fs_context()
286 	if (!fc)  in alloc_fs_context()
289 	fc->purpose	= purpose;  in alloc_fs_context()
290 	fc->sb_flags	= sb_flags;  in alloc_fs_context()
291 	fc->sb_flags_mask = sb_flags_mask;  in alloc_fs_context()
292 	fc->fs_type	= get_filesystem(fs_type);  in alloc_fs_context()
293 	fc->cred	= get_current_cred();  in alloc_fs_context()
294 	fc->net_ns	= get_net(current->nsproxy->net_ns);  in alloc_fs_context()
295 	fc->log.prefix	= fs_type->name;  in alloc_fs_context()
297 	mutex_init(&fc->uapi_mutex);  in alloc_fs_context()
301 		fc->user_ns = get_user_ns(fc->cred->user_ns);  in alloc_fs_context()
304 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
308 		fc->user_ns = get_user_ns(reference->d_sb->s_user_ns);  in alloc_fs_context()
309 		fc->root = dget(reference);  in alloc_fs_context()
314 	init_fs_context = fc->fs_type->init_fs_context;  in alloc_fs_context()
318 	ret = init_fs_context(fc);  in alloc_fs_context()
321 	fc->need_free = true;  in alloc_fs_context()
322 	return fc;  in alloc_fs_context()
325 	put_fs_context(fc);  in alloc_fs_context()
352  * the fc->security object is inherited from @reference (if needed).
357 	struct fs_context *fc;  in fs_context_for_submount()  local
360 	fc = alloc_fs_context(type, reference, 0, 0, FS_CONTEXT_FOR_SUBMOUNT);  in fs_context_for_submount()
361 	if (IS_ERR(fc))  in fs_context_for_submount()
362 		return fc;  in fs_context_for_submount()
364 	ret = security_fs_context_submount(fc, reference->d_sb);  in fs_context_for_submount()
366 		put_fs_context(fc);  in fs_context_for_submount()
370 	return fc;  in fs_context_for_submount()
374 void fc_drop_locked(struct fs_context *fc)  in fc_drop_locked()  argument
376 	struct super_block *sb = fc->root->d_sb;  in fc_drop_locked()
377 	dput(fc->root);  in fc_drop_locked()
378 	fc->root = NULL;  in fc_drop_locked()
382 static void legacy_fs_context_free(struct fs_context *fc);
390 	struct fs_context *fc;  in vfs_dup_fs_context()  local
396 	fc = kmemdup(src_fc, sizeof(struct fs_context), GFP_KERNEL);  in vfs_dup_fs_context()
397 	if (!fc)  in vfs_dup_fs_context()
400 	mutex_init(&fc->uapi_mutex);  in vfs_dup_fs_context()
402 	fc->fs_private	= NULL;  in vfs_dup_fs_context()
403 	fc->s_fs_info	= NULL;  in vfs_dup_fs_context()
404 	fc->source	= NULL;  in vfs_dup_fs_context()
405 	fc->security	= NULL;  in vfs_dup_fs_context()
406 	get_filesystem(fc->fs_type);  in vfs_dup_fs_context()
407 	get_net(fc->net_ns);  in vfs_dup_fs_context()
408 	get_user_ns(fc->user_ns);  in vfs_dup_fs_context()
409 	get_cred(fc->cred);  in vfs_dup_fs_context()
410 	if (fc->log.log)  in vfs_dup_fs_context()
411 		refcount_inc(&fc->log.log->usage);  in vfs_dup_fs_context()
414 	ret = fc->ops->dup(fc, src_fc);  in vfs_dup_fs_context()
418 	ret = security_fs_context_dup(fc, src_fc);  in vfs_dup_fs_context()
421 	return fc;  in vfs_dup_fs_context()
424 	put_fs_context(fc);  in vfs_dup_fs_context()
488 static void put_fc_log(struct fs_context *fc)  in put_fc_log()  argument
490 	struct fc_log *log = fc->log.log;  in put_fc_log()
495 			fc->log.log = NULL;  in put_fc_log()
506  * @fc: The context to dispose of.
508 void put_fs_context(struct fs_context *fc)  in put_fs_context()  argument
512 	if (fc->root) {  in put_fs_context()
513 		sb = fc->root->d_sb;  in put_fs_context()
514 		dput(fc->root);  in put_fs_context()
515 		fc->root = NULL;  in put_fs_context()
519 	if (fc->need_free && fc->ops && fc->ops->free)  in put_fs_context()
520 		fc->ops->free(fc);  in put_fs_context()
522 	security_free_mnt_opts(&fc->security);  in put_fs_context()
523 	put_net(fc->net_ns);  in put_fs_context()
524 	put_user_ns(fc->user_ns);  in put_fs_context()
525 	put_cred(fc->cred);  in put_fs_context()
526 	put_fc_log(fc);  in put_fs_context()
527 	put_filesystem(fc->fs_type);  in put_fs_context()
528 	kfree(fc->source);  in put_fs_context()
529 	kfree(fc);  in put_fs_context()
536 static void legacy_fs_context_free(struct fs_context *fc)  in legacy_fs_context_free()  argument
538 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_fs_context_free()
550 static int legacy_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)  in legacy_fs_context_dup()  argument
568 	fc->fs_private = ctx;  in legacy_fs_context_dup()
576 static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)  in legacy_parse_param()  argument
578 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_param()
583 	ret = vfs_parse_fs_param_source(fc, param);  in legacy_parse_param()
588 		return invalf(fc, "VFS: Legacy: Can't mix monolithic and individual options");  in legacy_parse_param()
598 		return invalf(fc, "VFS: Legacy: Parameter type for '%s' not supported",  in legacy_parse_param()
603 		return invalf(fc, "VFS: Legacy: Cumulative options too large");  in legacy_parse_param()
607 		return invalf(fc, "VFS: Legacy: Option '%s' contained comma",  in legacy_parse_param()
634 static int legacy_parse_monolithic(struct fs_context *fc, void *data)  in legacy_parse_monolithic()  argument
636 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_parse_monolithic()
648 	if (fc->fs_type->fs_flags & FS_BINARY_MOUNTDATA)  in legacy_parse_monolithic()
650 	return security_sb_eat_lsm_opts(ctx->legacy_data, &fc->security);  in legacy_parse_monolithic()
656 static int legacy_get_tree(struct fs_context *fc)  in legacy_get_tree()  argument
658 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_get_tree()
662 	root = fc->fs_type->mount(fc->fs_type, fc->sb_flags,  in legacy_get_tree()
663 				      fc->source, ctx->legacy_data);  in legacy_get_tree()
670 	fc->root = root;  in legacy_get_tree()
677 static int legacy_reconfigure(struct fs_context *fc)  in legacy_reconfigure()  argument
679 	struct legacy_fs_context *ctx = fc->fs_private;  in legacy_reconfigure()
680 	struct super_block *sb = fc->root->d_sb;  in legacy_reconfigure()
685 	return sb->s_op->remount_fs(sb, &fc->sb_flags,  in legacy_reconfigure()
702 static int legacy_init_fs_context(struct fs_context *fc)  in legacy_init_fs_context()  argument
704 	fc->fs_private = kzalloc(sizeof(struct legacy_fs_context), GFP_KERNEL_ACCOUNT);  in legacy_init_fs_context()
705 	if (!fc->fs_private)  in legacy_init_fs_context()
707 	fc->ops = &legacy_fs_context_ops;  in legacy_init_fs_context()
711 int parse_monolithic_mount_data(struct fs_context *fc, void *data)  in parse_monolithic_mount_data()  argument
715 	monolithic_mount_data = fc->ops->parse_monolithic;  in parse_monolithic_mount_data()
719 	return monolithic_mount_data(fc, data);  in parse_monolithic_mount_data()
735 void vfs_clean_context(struct fs_context *fc)  in vfs_clean_context()  argument
737 	if (fc->need_free && fc->ops && fc->ops->free)  in vfs_clean_context()
738 		fc->ops->free(fc);  in vfs_clean_context()
739 	fc->need_free = false;  in vfs_clean_context()
740 	fc->fs_private = NULL;  in vfs_clean_context()
741 	fc->s_fs_info = NULL;  in vfs_clean_context()
742 	fc->sb_flags = 0;  in vfs_clean_context()
743 	security_free_mnt_opts(&fc->security);  in vfs_clean_context()
744 	kfree(fc->source);  in vfs_clean_context()
745 	fc->source = NULL;  in vfs_clean_context()
746 	fc->exclusive = false;  in vfs_clean_context()
748 	fc->purpose = FS_CONTEXT_FOR_RECONFIGURE;  in vfs_clean_context()
749 	fc->phase = FS_CONTEXT_AWAITING_RECONF;  in vfs_clean_context()
752 int finish_clean_context(struct fs_context *fc)  in finish_clean_context()  argument
756 	if (fc->phase != FS_CONTEXT_AWAITING_RECONF)  in finish_clean_context()
759 	if (fc->fs_type->init_fs_context)  in finish_clean_context()
760 		error = fc->fs_type->init_fs_context(fc);  in finish_clean_context()
762 		error = legacy_init_fs_context(fc);  in finish_clean_context()
764 		fc->phase = FS_CONTEXT_FAILED;  in finish_clean_context()
767 	fc->need_free = true;  in finish_clean_context()
768 	fc->phase = FS_CONTEXT_RECONF_PARAMS;  in finish_clean_context()