3   Copyright (C) 2001-2008  Miklos Szeredi <miklos@szeredi.hu>
18  * This is non-NULL when the single instance of the control filesystem
27 	fc = file_inode(file)->i_private;  in fuse_ctl_file_conn_get()
39 		if (fc->abort_err)  in fuse_conn_abort_write()
40 			fc->aborted = true;  in fuse_conn_abort_write()
59 		value = atomic_read(&fc->num_waiting);  in fuse_conn_waiting_read()
60 		file->private_data = (void *)value;  in fuse_conn_waiting_read()
63 	size = sprintf(tmp, "%ld\n", (long)file->private_data);  in fuse_conn_waiting_read()
81 	unsigned limit = (1 << 16) - 1;  in fuse_conn_limit_write()
85 		return -EINVAL;  in fuse_conn_limit_write()
95 		return -EINVAL;  in fuse_conn_limit_write()
113 	val = READ_ONCE(fc->max_background);  in fuse_conn_max_background_read()
131 			spin_lock(&fc->bg_lock);  in fuse_conn_max_background_write()
132 			fc->max_background = val;  in fuse_conn_max_background_write()
133 			fc->blocked = fc->num_background >= fc->max_background;  in fuse_conn_max_background_write()
134 			if (!fc->blocked)  in fuse_conn_max_background_write()
135 				wake_up(&fc->blocked_waitq);  in fuse_conn_max_background_write()
136 			spin_unlock(&fc->bg_lock);  in fuse_conn_max_background_write()
155 	val = READ_ONCE(fc->congestion_threshold);  in fuse_conn_congestion_threshold_read()
177 	WRITE_ONCE(fc->congestion_threshold, val);  in fuse_conn_congestion_threshold_write()
205 static struct dentry *fuse_ctl_add_dentry(struct dentry *parent,  in fuse_ctl_add_dentry()  argument
215 	BUG_ON(fc->ctl_ndents >= FUSE_CTL_NUM_DENTRIES);  in fuse_ctl_add_dentry()
216 	dentry = d_alloc_name(parent, name);  in fuse_ctl_add_dentry()
226 	inode->i_ino = get_next_ino();  in fuse_ctl_add_dentry()
227 	inode->i_mode = mode;  in fuse_ctl_add_dentry()
228 	inode->i_uid = fc->user_id;  in fuse_ctl_add_dentry()
229 	inode->i_gid = fc->group_id;  in fuse_ctl_add_dentry()
231 	/* setting ->i_op to NULL is not allowed */  in fuse_ctl_add_dentry()
233 		inode->i_op = iop;  in fuse_ctl_add_dentry()
234 	inode->i_fop = fop;  in fuse_ctl_add_dentry()
236 	inode->i_private = fc;  in fuse_ctl_add_dentry()
239 	fc->ctl_dentry[fc->ctl_ndents++] = dentry;  in fuse_ctl_add_dentry()
245  * Add a connection to the control filesystem (if it exists).  Caller
250 	struct dentry *parent;  in fuse_ctl_add_conn()  local
253 	if (!fuse_control_sb || fc->no_control)  in fuse_ctl_add_conn()
256 	parent = fuse_control_sb->s_root;  in fuse_ctl_add_conn()
257 	inc_nlink(d_inode(parent));  in fuse_ctl_add_conn()
258 	sprintf(name, "%u", fc->dev);  in fuse_ctl_add_conn()
259 	parent = fuse_ctl_add_dentry(parent, fc, name, S_IFDIR | 0500, 2,  in fuse_ctl_add_conn()
262 	if (!parent)  in fuse_ctl_add_conn()
265 	if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG | 0400, 1,  in fuse_ctl_add_conn()
267 	    !fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG | 0200, 1,  in fuse_ctl_add_conn()
269 	    !fuse_ctl_add_dentry(parent, fc, "max_background", S_IFREG | 0600,  in fuse_ctl_add_conn()
271 	    !fuse_ctl_add_dentry(parent, fc, "congestion_threshold",  in fuse_ctl_add_conn()
280 	return -ENOMEM;  in fuse_ctl_add_conn()
284  * Remove a connection from the control filesystem (if it exists).
291 	if (!fuse_control_sb || fc->no_control)  in fuse_ctl_remove_conn()
294 	for (i = fc->ctl_ndents - 1; i >= 0; i--) {  in fuse_ctl_remove_conn()
295 		struct dentry *dentry = fc->ctl_dentry[i];  in fuse_ctl_remove_conn()
296 		d_inode(dentry)->i_private = NULL;  in fuse_ctl_remove_conn()
303 	drop_nlink(d_inode(fuse_control_sb->s_root));  in fuse_ctl_remove_conn()
343 	fsc->ops = &fuse_ctl_context_ops;  in fuse_ctl_init_fs_context()
354 		fc->ctl_ndents = 0;  in fuse_ctl_kill_sb()