v4.19.13 snapshot.
diff --git a/drivers/isdn/divert/divert_procfs.c b/drivers/isdn/divert/divert_procfs.c
new file mode 100644
index 0000000..342585e
--- /dev/null
+++ b/drivers/isdn/divert/divert_procfs.c
@@ -0,0 +1,336 @@
+/* $Id: divert_procfs.c,v 1.11.6.2 2001/09/23 22:24:36 kai Exp $
+ *
+ * Filesystem handling for the diversion supplementary services.
+ *
+ * Copyright 1998 by Werner Cornelius (werner@isdn4linux.de)
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#ifdef CONFIG_PROC_FS
+#include <linux/proc_fs.h>
+#else
+#include <linux/fs.h>
+#endif
+#include <linux/sched.h>
+#include <linux/isdnif.h>
+#include <net/net_namespace.h>
+#include <linux/mutex.h>
+#include "isdn_divert.h"
+
+
+/*********************************/
+/* Variables for interface queue */
+/*********************************/
+ulong if_used = 0; /* number of interface users */
+static DEFINE_MUTEX(isdn_divert_mutex);
+static struct divert_info *divert_info_head = NULL; /* head of queue */
+static struct divert_info *divert_info_tail = NULL; /* pointer to last entry */
+static DEFINE_SPINLOCK(divert_info_lock);/* lock for queue */
+static wait_queue_head_t rd_queue;
+
+/*********************************/
+/* put an info buffer into queue */
+/*********************************/
+void
+put_info_buffer(char *cp)
+{
+ struct divert_info *ib;
+ unsigned long flags;
+
+ if (if_used <= 0)
+ return;
+ if (!cp)
+ return;
+ if (!*cp)
+ return;
+ if (!(ib = kmalloc(sizeof(struct divert_info) + strlen(cp), GFP_ATOMIC)))
+ return; /* no memory */
+ strcpy(ib->info_start, cp); /* set output string */
+ ib->next = NULL;
+ spin_lock_irqsave(&divert_info_lock, flags);
+ ib->usage_cnt = if_used;
+ if (!divert_info_head)
+ divert_info_head = ib; /* new head */
+ else
+ divert_info_tail->next = ib; /* follows existing messages */
+ divert_info_tail = ib; /* new tail */
+
+ /* delete old entrys */
+ while (divert_info_head->next) {
+ if ((divert_info_head->usage_cnt <= 0) &&
+ (divert_info_head->next->usage_cnt <= 0)) {
+ ib = divert_info_head;
+ divert_info_head = divert_info_head->next;
+ kfree(ib);
+ } else
+ break;
+ } /* divert_info_head->next */
+ spin_unlock_irqrestore(&divert_info_lock, flags);
+ wake_up_interruptible(&(rd_queue));
+} /* put_info_buffer */
+
+#ifdef CONFIG_PROC_FS
+
+/**********************************/
+/* deflection device read routine */
+/**********************************/
+static ssize_t
+isdn_divert_read(struct file *file, char __user *buf, size_t count, loff_t *off)
+{
+ struct divert_info *inf;
+ int len;
+
+ if (!(inf = *((struct divert_info **) file->private_data))) {
+ if (file->f_flags & O_NONBLOCK)
+ return -EAGAIN;
+ wait_event_interruptible(rd_queue, (inf =
+ *((struct divert_info **) file->private_data)));
+ }
+ if (!inf)
+ return (0);
+
+ inf->usage_cnt--; /* new usage count */
+ file->private_data = &inf->next; /* next structure */
+ if ((len = strlen(inf->info_start)) <= count) {
+ if (copy_to_user(buf, inf->info_start, len))
+ return -EFAULT;
+ *off += len;
+ return (len);
+ }
+ return (0);
+} /* isdn_divert_read */
+
+/**********************************/
+/* deflection device write routine */
+/**********************************/
+static ssize_t
+isdn_divert_write(struct file *file, const char __user *buf, size_t count, loff_t *off)
+{
+ return (-ENODEV);
+} /* isdn_divert_write */
+
+
+/***************************************/
+/* select routines for various kernels */
+/***************************************/
+static __poll_t
+isdn_divert_poll(struct file *file, poll_table *wait)
+{
+ __poll_t mask = 0;
+
+ poll_wait(file, &(rd_queue), wait);
+ /* mask = EPOLLOUT | EPOLLWRNORM; */
+ if (*((struct divert_info **) file->private_data)) {
+ mask |= EPOLLIN | EPOLLRDNORM;
+ }
+ return mask;
+} /* isdn_divert_poll */
+
+/****************/
+/* Open routine */
+/****************/
+static int
+isdn_divert_open(struct inode *ino, struct file *filep)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&divert_info_lock, flags);
+ if_used++;
+ if (divert_info_head)
+ filep->private_data = &(divert_info_tail->next);
+ else
+ filep->private_data = &divert_info_head;
+ spin_unlock_irqrestore(&divert_info_lock, flags);
+ /* start_divert(); */
+ return nonseekable_open(ino, filep);
+} /* isdn_divert_open */
+
+/*******************/
+/* close routine */
+/*******************/
+static int
+isdn_divert_close(struct inode *ino, struct file *filep)
+{
+ struct divert_info *inf;
+ unsigned long flags;
+
+ spin_lock_irqsave(&divert_info_lock, flags);
+ if_used--;
+ inf = *((struct divert_info **) filep->private_data);
+ while (inf) {
+ inf->usage_cnt--;
+ inf = inf->next;
+ }
+ if (if_used <= 0)
+ while (divert_info_head) {
+ inf = divert_info_head;
+ divert_info_head = divert_info_head->next;
+ kfree(inf);
+ }
+ spin_unlock_irqrestore(&divert_info_lock, flags);
+ return (0);
+} /* isdn_divert_close */
+
+/*********/
+/* IOCTL */
+/*********/
+static int isdn_divert_ioctl_unlocked(struct file *file, uint cmd, ulong arg)
+{
+ divert_ioctl dioctl;
+ int i;
+ unsigned long flags;
+ divert_rule *rulep;
+ char *cp;
+
+ if (copy_from_user(&dioctl, (void __user *) arg, sizeof(dioctl)))
+ return -EFAULT;
+
+ switch (cmd) {
+ case IIOCGETVER:
+ dioctl.drv_version = DIVERT_IIOC_VERSION; /* set version */
+ break;
+
+ case IIOCGETDRV:
+ if ((dioctl.getid.drvid = divert_if.name_to_drv(dioctl.getid.drvnam)) < 0)
+ return (-EINVAL);
+ break;
+
+ case IIOCGETNAM:
+ cp = divert_if.drv_to_name(dioctl.getid.drvid);
+ if (!cp)
+ return (-EINVAL);
+ if (!*cp)
+ return (-EINVAL);
+ strcpy(dioctl.getid.drvnam, cp);
+ break;
+
+ case IIOCGETRULE:
+ if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
+ return (-EINVAL);
+ dioctl.getsetrule.rule = *rulep; /* copy data */
+ break;
+
+ case IIOCMODRULE:
+ if (!(rulep = getruleptr(dioctl.getsetrule.ruleidx)))
+ return (-EINVAL);
+ spin_lock_irqsave(&divert_lock, flags);
+ *rulep = dioctl.getsetrule.rule; /* copy data */
+ spin_unlock_irqrestore(&divert_lock, flags);
+ return (0); /* no copy required */
+ break;
+
+ case IIOCINSRULE:
+ return (insertrule(dioctl.getsetrule.ruleidx, &dioctl.getsetrule.rule));
+ break;
+
+ case IIOCDELRULE:
+ return (deleterule(dioctl.getsetrule.ruleidx));
+ break;
+
+ case IIOCDODFACT:
+ return (deflect_extern_action(dioctl.fwd_ctrl.subcmd,
+ dioctl.fwd_ctrl.callid,
+ dioctl.fwd_ctrl.to_nr));
+
+ case IIOCDOCFACT:
+ case IIOCDOCFDIS:
+ case IIOCDOCFINT:
+ if (!divert_if.drv_to_name(dioctl.cf_ctrl.drvid))
+ return (-EINVAL); /* invalid driver */
+ if (strnlen(dioctl.cf_ctrl.msn, sizeof(dioctl.cf_ctrl.msn)) ==
+ sizeof(dioctl.cf_ctrl.msn))
+ return -EINVAL;
+ if (strnlen(dioctl.cf_ctrl.fwd_nr, sizeof(dioctl.cf_ctrl.fwd_nr)) ==
+ sizeof(dioctl.cf_ctrl.fwd_nr))
+ return -EINVAL;
+ if ((i = cf_command(dioctl.cf_ctrl.drvid,
+ (cmd == IIOCDOCFACT) ? 1 : (cmd == IIOCDOCFDIS) ? 0 : 2,
+ dioctl.cf_ctrl.cfproc,
+ dioctl.cf_ctrl.msn,
+ dioctl.cf_ctrl.service,
+ dioctl.cf_ctrl.fwd_nr,
+ &dioctl.cf_ctrl.procid)))
+ return (i);
+ break;
+
+ default:
+ return (-EINVAL);
+ } /* switch cmd */
+ return copy_to_user((void __user *)arg, &dioctl, sizeof(dioctl)) ? -EFAULT : 0;
+} /* isdn_divert_ioctl */
+
+static long isdn_divert_ioctl(struct file *file, uint cmd, ulong arg)
+{
+ long ret;
+
+ mutex_lock(&isdn_divert_mutex);
+ ret = isdn_divert_ioctl_unlocked(file, cmd, arg);
+ mutex_unlock(&isdn_divert_mutex);
+
+ return ret;
+}
+
+static const struct file_operations isdn_fops =
+{
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = isdn_divert_read,
+ .write = isdn_divert_write,
+ .poll = isdn_divert_poll,
+ .unlocked_ioctl = isdn_divert_ioctl,
+ .open = isdn_divert_open,
+ .release = isdn_divert_close,
+};
+
+/****************************/
+/* isdn subdir in /proc/net */
+/****************************/
+static struct proc_dir_entry *isdn_proc_entry = NULL;
+static struct proc_dir_entry *isdn_divert_entry = NULL;
+#endif /* CONFIG_PROC_FS */
+
+/***************************************************************************/
+/* divert_dev_init must be called before the proc filesystem may be used */
+/***************************************************************************/
+int
+divert_dev_init(void)
+{
+
+ init_waitqueue_head(&rd_queue);
+
+#ifdef CONFIG_PROC_FS
+ isdn_proc_entry = proc_mkdir("isdn", init_net.proc_net);
+ if (!isdn_proc_entry)
+ return (-1);
+ isdn_divert_entry = proc_create("divert", S_IFREG | S_IRUGO,
+ isdn_proc_entry, &isdn_fops);
+ if (!isdn_divert_entry) {
+ remove_proc_entry("isdn", init_net.proc_net);
+ return (-1);
+ }
+#endif /* CONFIG_PROC_FS */
+
+ return (0);
+} /* divert_dev_init */
+
+/***************************************************************************/
+/* divert_dev_deinit must be called before leaving isdn when included as */
+/* a module. */
+/***************************************************************************/
+int
+divert_dev_deinit(void)
+{
+
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("divert", isdn_proc_entry);
+ remove_proc_entry("isdn", init_net.proc_net);
+#endif /* CONFIG_PROC_FS */
+
+ return (0);
+} /* divert_dev_deinit */