114 		struct fuse_conn *fc = get_fuse_conn(inode);  in fuse_evict_inode()  local
115 		fuse_queue_forget(fc, fi->forget, fi->nodeid, fi->nlookup);  in fuse_evict_inode()
148 	struct fuse_conn *fc = get_fuse_conn(inode);  in fuse_change_attributes_common()  local
153 	fi->attr_version = atomic64_inc_return(&fc->attr_version);  in fuse_change_attributes_common()
160 	inode->i_uid     = make_kuid(fc->user_ns, attr->uid);  in fuse_change_attributes_common()
161 	inode->i_gid     = make_kgid(fc->user_ns, attr->gid);  in fuse_change_attributes_common()
166 	if (!fc->writeback_cache || !S_ISREG(inode->i_mode)) {  in fuse_change_attributes_common()
184 	if (!fc->default_permissions)  in fuse_change_attributes_common()
193 	struct fuse_conn *fc = get_fuse_conn(inode);  in fuse_change_attributes()  local
195 	bool is_wb = fc->writeback_cache;  in fuse_change_attributes()
224 			if (!fc->explicit_inval_data)  in fuse_change_attributes()
226 		} else if (fc->auto_inval_data) {  in fuse_change_attributes()
291 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_iget()  local
300 		if (!fc->writeback_cache || !S_ISREG(attr->mode))  in fuse_iget()
367 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_umount_begin()  local
369 	if (!fc->no_force_umount)  in fuse_umount_begin()
370 		fuse_abort_conn(fc);  in fuse_umount_begin()
373 static void fuse_send_destroy(struct fuse_conn *fc)  in fuse_send_destroy()  argument
375 	if (fc->conn_init) {  in fuse_send_destroy()
381 		fuse_simple_request(fc, &args);  in fuse_send_destroy()
387 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_put_super()  local
390 	list_del(&fc->entry);  in fuse_put_super()
391 	fuse_ctl_remove_conn(fc);  in fuse_put_super()
394 	fuse_conn_put(fc);  in fuse_put_super()
414 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_statfs()  local
419 	if (!fuse_allow_current_process(fc)) {  in fuse_statfs()
431 	err = fuse_simple_request(fc, &args);  in fuse_statfs()
470 static int fuse_parse_param(struct fs_context *fc, struct fs_parameter *param)  in fuse_parse_param()  argument
473 	struct fuse_fs_context *ctx = fc->fs_private;  in fuse_parse_param()
476 	opt = fs_parse(fc, &fuse_fs_parameters, param, &result);  in fuse_parse_param()
482 		if (fc->source)  in fuse_parse_param()
483 			return invalf(fc, "fuse: Multiple sources specified");  in fuse_parse_param()
484 		fc->source = param->string;  in fuse_parse_param()
490 			return invalf(fc, "fuse: Multiple subtypes specified");  in fuse_parse_param()
502 			return invalf(fc, "fuse: Invalid rootmode");  in fuse_parse_param()
508 		ctx->user_id = make_kuid(fc->user_ns, result.uint_32);  in fuse_parse_param()
510 			return invalf(fc, "fuse: Invalid user_id");  in fuse_parse_param()
515 		ctx->group_id = make_kgid(fc->user_ns, result.uint_32);  in fuse_parse_param()
517 			return invalf(fc, "fuse: Invalid group_id");  in fuse_parse_param()
535 			return invalf(fc, "fuse: blksize only supported for fuseblk");  in fuse_parse_param()
546 static void fuse_free_fc(struct fs_context *fc)  in fuse_free_fc()  argument
548 	struct fuse_fs_context *ctx = fc->fs_private;  in fuse_free_fc()
559 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_show_options()  local
561 	if (fc->no_mount_options)  in fuse_show_options()
564 	seq_printf(m, ",user_id=%u", from_kuid_munged(fc->user_ns, fc->user_id));  in fuse_show_options()
565 	seq_printf(m, ",group_id=%u", from_kgid_munged(fc->user_ns, fc->group_id));  in fuse_show_options()
566 	if (fc->default_permissions)  in fuse_show_options()
568 	if (fc->allow_other)  in fuse_show_options()
570 	if (fc->max_read != ~0)  in fuse_show_options()
571 		seq_printf(m, ",max_read=%u", fc->max_read);  in fuse_show_options()
603 void fuse_conn_init(struct fuse_conn *fc, struct user_namespace *user_ns,  in fuse_conn_init()  argument
606 	memset(fc, 0, sizeof(*fc));  in fuse_conn_init()
607 	spin_lock_init(&fc->lock);  in fuse_conn_init()
608 	spin_lock_init(&fc->bg_lock);  in fuse_conn_init()
609 	init_rwsem(&fc->killsb);  in fuse_conn_init()
610 	refcount_set(&fc->count, 1);  in fuse_conn_init()
611 	atomic_set(&fc->dev_count, 1);  in fuse_conn_init()
612 	init_waitqueue_head(&fc->blocked_waitq);  in fuse_conn_init()
613 	fuse_iqueue_init(&fc->iq, fiq_ops, fiq_priv);  in fuse_conn_init()
614 	INIT_LIST_HEAD(&fc->bg_queue);  in fuse_conn_init()
615 	INIT_LIST_HEAD(&fc->entry);  in fuse_conn_init()
616 	INIT_LIST_HEAD(&fc->devices);  in fuse_conn_init()
617 	atomic_set(&fc->num_waiting, 0);  in fuse_conn_init()
618 	fc->max_background = FUSE_DEFAULT_MAX_BACKGROUND;  in fuse_conn_init()
619 	fc->congestion_threshold = FUSE_DEFAULT_CONGESTION_THRESHOLD;  in fuse_conn_init()
620 	atomic64_set(&fc->khctr, 0);  in fuse_conn_init()
621 	fc->polled_files = RB_ROOT;  in fuse_conn_init()
622 	fc->blocked = 0;  in fuse_conn_init()
623 	fc->initialized = 0;  in fuse_conn_init()
624 	fc->connected = 1;  in fuse_conn_init()
625 	atomic64_set(&fc->attr_version, 1);  in fuse_conn_init()
626 	get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));  in fuse_conn_init()
627 	fc->pid_ns = get_pid_ns(task_active_pid_ns(current));  in fuse_conn_init()
628 	fc->user_ns = get_user_ns(user_ns);  in fuse_conn_init()
629 	fc->max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ;  in fuse_conn_init()
633 void fuse_conn_put(struct fuse_conn *fc)  in fuse_conn_put()  argument
635 	if (refcount_dec_and_test(&fc->count)) {  in fuse_conn_put()
636 		struct fuse_iqueue *fiq = &fc->iq;  in fuse_conn_put()
640 		put_pid_ns(fc->pid_ns);  in fuse_conn_put()
641 		put_user_ns(fc->user_ns);  in fuse_conn_put()
642 		fc->release(fc);  in fuse_conn_put()
647 struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)  in fuse_conn_get()  argument
649 	refcount_inc(&fc->count);  in fuse_conn_get()
650 	return fc;  in fuse_conn_get()
673 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_get_dentry()  local
686 		if (!fc->export_support)  in fuse_get_dentry()
780 	struct fuse_conn *fc = get_fuse_conn(child_inode);  in fuse_get_parent()  local
787 	if (!fc->export_support)  in fuse_get_parent()
851 static void process_init_limits(struct fuse_conn *fc, struct fuse_init_out *arg)  in process_init_limits()  argument
861 	spin_lock(&fc->bg_lock);  in process_init_limits()
863 		fc->max_background = arg->max_background;  in process_init_limits()
865 		if (!cap_sys_admin && fc->max_background > max_user_bgreq)  in process_init_limits()
866 			fc->max_background = max_user_bgreq;  in process_init_limits()
869 		fc->congestion_threshold = arg->congestion_threshold;  in process_init_limits()
872 		    fc->congestion_threshold > max_user_congthresh)  in process_init_limits()
873 			fc->congestion_threshold = max_user_congthresh;  in process_init_limits()
875 	spin_unlock(&fc->bg_lock);  in process_init_limits()
884 static void process_init_reply(struct fuse_conn *fc, struct fuse_args *args,  in process_init_reply()  argument
891 		fc->conn_error = 1;  in process_init_reply()
895 		process_init_limits(fc, arg);  in process_init_reply()
900 				fc->async_read = 1;  in process_init_reply()
902 				fc->no_lock = 1;  in process_init_reply()
905 					fc->no_flock = 1;  in process_init_reply()
908 					fc->no_flock = 1;  in process_init_reply()
911 				fc->atomic_o_trunc = 1;  in process_init_reply()
915 					fc->export_support = 1;  in process_init_reply()
918 				fc->big_writes = 1;  in process_init_reply()
920 				fc->dont_mask = 1;  in process_init_reply()
922 				fc->auto_inval_data = 1;  in process_init_reply()
924 				fc->explicit_inval_data = 1;  in process_init_reply()
926 				fc->do_readdirplus = 1;  in process_init_reply()
928 					fc->readdirplus_auto = 1;  in process_init_reply()
931 				fc->async_dio = 1;  in process_init_reply()
933 				fc->writeback_cache = 1;  in process_init_reply()
935 				fc->parallel_dirops = 1;  in process_init_reply()
937 				fc->handle_killpriv = 1;  in process_init_reply()
939 				fc->sb->s_time_gran = arg->time_gran;  in process_init_reply()
941 				fc->default_permissions = 1;  in process_init_reply()
942 				fc->posix_acl = 1;  in process_init_reply()
943 				fc->sb->s_xattr = fuse_acl_xattr_handlers;  in process_init_reply()
946 				fc->cache_symlinks = 1;  in process_init_reply()
948 				fc->abort_err = 1;  in process_init_reply()
950 				fc->max_pages =  in process_init_reply()
955 			ra_pages = fc->max_read / PAGE_SIZE;  in process_init_reply()
956 			fc->no_lock = 1;  in process_init_reply()
957 			fc->no_flock = 1;  in process_init_reply()
960 		fc->sb->s_bdi->ra_pages =  in process_init_reply()
961 				min(fc->sb->s_bdi->ra_pages, ra_pages);  in process_init_reply()
962 		fc->minor = arg->minor;  in process_init_reply()
963 		fc->max_write = arg->minor < 5 ? 4096 : arg->max_write;  in process_init_reply()
964 		fc->max_write = max_t(unsigned, 4096, fc->max_write);  in process_init_reply()
965 		fc->conn_init = 1;  in process_init_reply()
969 	fuse_set_initialized(fc);  in process_init_reply()
970 	wake_up_all(&fc->blocked_waitq);  in process_init_reply()
973 void fuse_send_init(struct fuse_conn *fc)  in fuse_send_init()  argument
981 	ia->in.max_readahead = fc->sb->s_bdi->ra_pages * PAGE_SIZE;  in fuse_send_init()
1007 	if (fuse_simple_background(fc, &ia->args, GFP_KERNEL) != 0)  in fuse_send_init()
1008 		process_init_reply(fc, &ia->args, -ENOTCONN);  in fuse_send_init()
1012 void fuse_free_conn(struct fuse_conn *fc)  in fuse_free_conn()  argument
1014 	WARN_ON(!list_empty(&fc->devices));  in fuse_free_conn()
1015 	kfree_rcu(fc, rcu);  in fuse_free_conn()
1019 static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)  in fuse_bdi_init()  argument
1033 	err = super_setup_bdi_name(sb, "%u:%u%s", MAJOR(fc->dev),  in fuse_bdi_init()
1034 				   MINOR(fc->dev), suffix);  in fuse_bdi_init()
1081 void fuse_dev_install(struct fuse_dev *fud, struct fuse_conn *fc)  in fuse_dev_install()  argument
1083 	fud->fc = fuse_conn_get(fc);  in fuse_dev_install()
1084 	spin_lock(&fc->lock);  in fuse_dev_install()
1085 	list_add_tail(&fud->entry, &fc->devices);  in fuse_dev_install()
1086 	spin_unlock(&fc->lock);  in fuse_dev_install()
1090 struct fuse_dev *fuse_dev_alloc_install(struct fuse_conn *fc)  in fuse_dev_alloc_install()  argument
1098 	fuse_dev_install(fud, fc);  in fuse_dev_alloc_install()
1105 	struct fuse_conn *fc = fud->fc;  in fuse_dev_free()  local
1107 	if (fc) {  in fuse_dev_free()
1108 		spin_lock(&fc->lock);  in fuse_dev_free()
1110 		spin_unlock(&fc->lock);  in fuse_dev_free()
1112 		fuse_conn_put(fc);  in fuse_dev_free()
1122 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_fill_super_common()  local
1163 	fud = fuse_dev_alloc_install(fc);  in fuse_fill_super_common()
1167 	fc->dev = sb->s_dev;  in fuse_fill_super_common()
1168 	fc->sb = sb;  in fuse_fill_super_common()
1169 	err = fuse_bdi_init(fc, sb);  in fuse_fill_super_common()
1175 		fc->dont_mask = 1;  in fuse_fill_super_common()
1178 	fc->default_permissions = ctx->default_permissions;  in fuse_fill_super_common()
1179 	fc->allow_other = ctx->allow_other;  in fuse_fill_super_common()
1180 	fc->user_id = ctx->user_id;  in fuse_fill_super_common()
1181 	fc->group_id = ctx->group_id;  in fuse_fill_super_common()
1182 	fc->max_read = max_t(unsigned, 4096, ctx->max_read);  in fuse_fill_super_common()
1183 	fc->destroy = ctx->destroy;  in fuse_fill_super_common()
1184 	fc->no_control = ctx->no_control;  in fuse_fill_super_common()
1185 	fc->no_force_umount = ctx->no_force_umount;  in fuse_fill_super_common()
1186 	fc->no_mount_options = ctx->no_mount_options;  in fuse_fill_super_common()
1202 	err = fuse_ctl_add_conn(fc);  in fuse_fill_super_common()
1206 	list_add_tail(&fc->entry, &fuse_conn_list);  in fuse_fill_super_common()
1227 	struct fuse_conn *fc;  in fuse_fill_super()  local
1243 	fc = kmalloc(sizeof(*fc), GFP_KERNEL);  in fuse_fill_super()
1245 	if (!fc)  in fuse_fill_super()
1248 	fuse_conn_init(fc, sb->s_user_ns, &fuse_dev_fiq_ops, NULL);  in fuse_fill_super()
1249 	fc->release = fuse_free_conn;  in fuse_fill_super()
1250 	sb->s_fs_info = fc;  in fuse_fill_super()
1265 	fuse_conn_put(fc);  in fuse_fill_super()
1273 static int fuse_get_tree(struct fs_context *fc)  in fuse_get_tree()  argument
1275 	struct fuse_fs_context *ctx = fc->fs_private;  in fuse_get_tree()
1283 		return get_tree_bdev(fc, fuse_fill_super);  in fuse_get_tree()
1286 	return get_tree_nodev(fc, fuse_fill_super);  in fuse_get_tree()
1298 static int fuse_init_fs_context(struct fs_context *fc)  in fuse_init_fs_context()  argument
1310 	if (fc->fs_type == &fuseblk_fs_type) {  in fuse_init_fs_context()
1316 	fc->fs_private = ctx;  in fuse_init_fs_context()
1317 	fc->ops = &fuse_context_ops;  in fuse_init_fs_context()
1323 	struct fuse_conn *fc = get_fuse_conn_super(sb);  in fuse_sb_destroy()  local
1325 	if (fc) {  in fuse_sb_destroy()
1326 		if (fc->destroy)  in fuse_sb_destroy()
1327 			fuse_send_destroy(fc);  in fuse_sb_destroy()
1329 		fuse_abort_conn(fc);  in fuse_sb_destroy()
1330 		fuse_wait_aborted(fc);  in fuse_sb_destroy()
1332 		down_write(&fc->killsb);  in fuse_sb_destroy()
1333 		fc->sb = NULL;  in fuse_sb_destroy()
1334 		up_write(&fc->killsb);  in fuse_sb_destroy()