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419 lines
12 KiB
419 lines
12 KiB
/*********************************************************************
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*
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* Filename: discovery.c
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* Version: 0.1
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* Description: Routines for handling discoveries at the IrLMP layer
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* Status: Experimental.
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* Author: Dag Brattli <dagb@cs.uit.no>
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* Created at: Tue Apr 6 15:33:50 1999
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* Modified at: Sat Oct 9 17:11:31 1999
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* Modified by: Dag Brattli <dagb@cs.uit.no>
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* Modified at: Fri May 28 3:11 CST 1999
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* Modified by: Horst von Brand <vonbrand@sleipnir.valparaiso.cl>
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*
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* Copyright (c) 1999 Dag Brattli, All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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********************************************************************/
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#include <linux/string.h>
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#include <linux/socket.h>
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#include <linux/fs.h>
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#include <linux/seq_file.h>
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#include <net/irda/irda.h>
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#include <net/irda/irlmp.h>
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#include <net/irda/discovery.h>
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/*
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* Function irlmp_add_discovery (cachelog, discovery)
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*
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* Add a new discovery to the cachelog, and remove any old discoveries
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* from the same device
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*
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* Note : we try to preserve the time this device was *first* discovered
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* (as opposed to the time of last discovery used for cleanup). This is
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* used by clients waiting for discovery events to tell if the device
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* discovered is "new" or just the same old one. They can't rely there
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* on a binary flag (new/old), because not all discovery events are
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* propagated to them, and they might not always listen, so they would
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* miss some new devices popping up...
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* Jean II
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*/
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void irlmp_add_discovery(hashbin_t *cachelog, discovery_t *new)
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{
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discovery_t *discovery, *node;
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unsigned long flags;
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/* Set time of first discovery if node is new (see below) */
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new->firststamp = new->timestamp;
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spin_lock_irqsave(&cachelog->hb_spinlock, flags);
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/*
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* Remove all discoveries of devices that has previously been
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* discovered on the same link with the same name (info), or the
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* same daddr. We do this since some devices (mostly PDAs) change
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* their device address between every discovery.
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*/
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discovery = (discovery_t *) hashbin_get_first(cachelog);
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while (discovery != NULL ) {
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node = discovery;
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/* Be sure to stay one item ahead */
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discovery = (discovery_t *) hashbin_get_next(cachelog);
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if ((node->data.saddr == new->data.saddr) &&
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((node->data.daddr == new->data.daddr) ||
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(strcmp(node->data.info, new->data.info) == 0)))
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{
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/* This discovery is a previous discovery
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* from the same device, so just remove it
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*/
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hashbin_remove_this(cachelog, (irda_queue_t *) node);
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/* Check if hints bits are unchanged */
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if(u16ho(node->data.hints) == u16ho(new->data.hints))
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/* Set time of first discovery for this node */
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new->firststamp = node->firststamp;
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kfree(node);
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}
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}
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/* Insert the new and updated version */
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hashbin_insert(cachelog, (irda_queue_t *) new, new->data.daddr, NULL);
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spin_unlock_irqrestore(&cachelog->hb_spinlock, flags);
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}
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/*
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* Function irlmp_add_discovery_log (cachelog, log)
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*
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* Merge a disovery log into the cachelog.
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*
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*/
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void irlmp_add_discovery_log(hashbin_t *cachelog, hashbin_t *log)
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{
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discovery_t *discovery;
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IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
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/*
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* If log is missing this means that IrLAP was unable to perform the
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* discovery, so restart discovery again with just the half timeout
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* of the normal one.
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*/
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/* Well... It means that there was nobody out there - Jean II */
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if (log == NULL) {
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/* irlmp_start_discovery_timer(irlmp, 150); */
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return;
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}
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/*
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* Locking : we are the only owner of this discovery log, so
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* no need to lock it.
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* We just need to lock the global log in irlmp_add_discovery().
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*/
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discovery = (discovery_t *) hashbin_remove_first(log);
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while (discovery != NULL) {
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irlmp_add_discovery(cachelog, discovery);
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discovery = (discovery_t *) hashbin_remove_first(log);
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}
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/* Delete the now empty log */
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hashbin_delete(log, (FREE_FUNC) kfree);
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}
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/*
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* Function irlmp_expire_discoveries (log, saddr, force)
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*
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* Go through all discoveries and expire all that has stayed too long
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*
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* Note : this assume that IrLAP won't change its saddr, which
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* currently is a valid assumption...
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*/
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void irlmp_expire_discoveries(hashbin_t *log, __u32 saddr, int force)
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{
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discovery_t * discovery;
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discovery_t * curr;
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unsigned long flags;
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discinfo_t * buffer = NULL;
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int n; /* Size of the full log */
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int i = 0; /* How many we expired */
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IRDA_ASSERT(log != NULL, return;);
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IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
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spin_lock_irqsave(&log->hb_spinlock, flags);
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discovery = (discovery_t *) hashbin_get_first(log);
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while (discovery != NULL) {
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/* Be sure to be one item ahead */
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curr = discovery;
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discovery = (discovery_t *) hashbin_get_next(log);
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/* Test if it's time to expire this discovery */
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if ((curr->data.saddr == saddr) &&
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(force ||
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((jiffies - curr->timestamp) > DISCOVERY_EXPIRE_TIMEOUT)))
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{
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/* Create buffer as needed.
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* As this function get called a lot and most time
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* we don't have anything to put in the log (we are
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* quite picky), we can save a lot of overhead
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* by not calling kmalloc. Jean II */
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if(buffer == NULL) {
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/* Create the client specific buffer */
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n = HASHBIN_GET_SIZE(log);
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buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
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if (buffer == NULL) {
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spin_unlock_irqrestore(&log->hb_spinlock, flags);
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return;
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}
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}
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/* Copy discovery information */
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memcpy(&(buffer[i]), &(curr->data),
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sizeof(discinfo_t));
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i++;
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/* Remove it from the log */
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curr = hashbin_remove_this(log, (irda_queue_t *) curr);
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kfree(curr);
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}
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}
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/* Drop the spinlock before calling the higher layers, as
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* we can't guarantee they won't call us back and create a
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* deadlock. We will work on our own private data, so we
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* don't care to be interupted. - Jean II */
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spin_unlock_irqrestore(&log->hb_spinlock, flags);
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if(buffer == NULL)
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return;
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/* Tell IrLMP and registered clients about it */
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irlmp_discovery_expiry(buffer, i);
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/* Free up our buffer */
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kfree(buffer);
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}
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#if 0
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/*
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* Function irlmp_dump_discoveries (log)
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*
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* Print out all discoveries in log
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*
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*/
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void irlmp_dump_discoveries(hashbin_t *log)
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{
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discovery_t *discovery;
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IRDA_ASSERT(log != NULL, return;);
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discovery = (discovery_t *) hashbin_get_first(log);
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while (discovery != NULL) {
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IRDA_DEBUG(0, "Discovery:\n");
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IRDA_DEBUG(0, " daddr=%08x\n", discovery->data.daddr);
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IRDA_DEBUG(0, " saddr=%08x\n", discovery->data.saddr);
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IRDA_DEBUG(0, " nickname=%s\n", discovery->data.info);
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discovery = (discovery_t *) hashbin_get_next(log);
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}
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}
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#endif
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/*
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* Function irlmp_copy_discoveries (log, pn, mask)
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*
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* Copy all discoveries in a buffer
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*
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* This function implement a safe way for lmp clients to access the
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* discovery log. The basic problem is that we don't want the log
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* to change (add/remove) while the client is reading it. If the
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* lmp client manipulate directly the hashbin, he is sure to get
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* into troubles...
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* The idea is that we copy all the current discovery log in a buffer
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* which is specific to the client and pass this copy to him. As we
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* do this operation with the spinlock grabbed, we are safe...
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* Note : we don't want those clients to grab the spinlock, because
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* we have no control on how long they will hold it...
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* Note : we choose to copy the log in "struct irda_device_info" to
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* save space...
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* Note : the client must kfree himself() the log...
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* Jean II
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*/
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struct irda_device_info *irlmp_copy_discoveries(hashbin_t *log, int *pn,
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__u16 mask, int old_entries)
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{
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discovery_t * discovery;
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unsigned long flags;
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discinfo_t * buffer = NULL;
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int j_timeout = (sysctl_discovery_timeout * HZ);
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int n; /* Size of the full log */
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int i = 0; /* How many we picked */
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IRDA_ASSERT(pn != NULL, return NULL;);
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IRDA_ASSERT(log != NULL, return NULL;);
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/* Save spin lock */
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spin_lock_irqsave(&log->hb_spinlock, flags);
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discovery = (discovery_t *) hashbin_get_first(log);
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while (discovery != NULL) {
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/* Mask out the ones we don't want :
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* We want to match the discovery mask, and to get only
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* the most recent one (unless we want old ones) */
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if ((u16ho(discovery->data.hints) & mask) &&
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((old_entries) ||
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((jiffies - discovery->firststamp) < j_timeout)) ) {
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/* Create buffer as needed.
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* As this function get called a lot and most time
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* we don't have anything to put in the log (we are
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* quite picky), we can save a lot of overhead
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* by not calling kmalloc. Jean II */
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if(buffer == NULL) {
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/* Create the client specific buffer */
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n = HASHBIN_GET_SIZE(log);
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buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
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if (buffer == NULL) {
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spin_unlock_irqrestore(&log->hb_spinlock, flags);
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return NULL;
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}
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}
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/* Copy discovery information */
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memcpy(&(buffer[i]), &(discovery->data),
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sizeof(discinfo_t));
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i++;
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}
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discovery = (discovery_t *) hashbin_get_next(log);
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}
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spin_unlock_irqrestore(&log->hb_spinlock, flags);
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/* Get the actual number of device in the buffer and return */
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*pn = i;
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return(buffer);
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}
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#ifdef CONFIG_PROC_FS
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static inline discovery_t *discovery_seq_idx(loff_t pos)
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{
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discovery_t *discovery;
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for (discovery = (discovery_t *) hashbin_get_first(irlmp->cachelog);
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discovery != NULL;
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discovery = (discovery_t *) hashbin_get_next(irlmp->cachelog)) {
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if (pos-- == 0)
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break;
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}
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return discovery;
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}
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static void *discovery_seq_start(struct seq_file *seq, loff_t *pos)
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{
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spin_lock_irq(&irlmp->cachelog->hb_spinlock);
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return *pos ? discovery_seq_idx(*pos - 1) : SEQ_START_TOKEN;
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}
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static void *discovery_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return (v == SEQ_START_TOKEN)
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? (void *) hashbin_get_first(irlmp->cachelog)
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: (void *) hashbin_get_next(irlmp->cachelog);
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}
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static void discovery_seq_stop(struct seq_file *seq, void *v)
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{
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spin_unlock_irq(&irlmp->cachelog->hb_spinlock);
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}
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static int discovery_seq_show(struct seq_file *seq, void *v)
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{
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if (v == SEQ_START_TOKEN)
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seq_puts(seq, "IrLMP: Discovery log:\n\n");
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else {
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const discovery_t *discovery = v;
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seq_printf(seq, "nickname: %s, hint: 0x%02x%02x",
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discovery->data.info,
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discovery->data.hints[0],
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discovery->data.hints[1]);
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#if 0
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if ( discovery->data.hints[0] & HINT_PNP)
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seq_puts(seq, "PnP Compatible ");
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if ( discovery->data.hints[0] & HINT_PDA)
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seq_puts(seq, "PDA/Palmtop ");
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if ( discovery->data.hints[0] & HINT_COMPUTER)
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seq_puts(seq, "Computer ");
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if ( discovery->data.hints[0] & HINT_PRINTER)
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seq_puts(seq, "Printer ");
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if ( discovery->data.hints[0] & HINT_MODEM)
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seq_puts(seq, "Modem ");
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if ( discovery->data.hints[0] & HINT_FAX)
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seq_puts(seq, "Fax ");
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if ( discovery->data.hints[0] & HINT_LAN)
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seq_puts(seq, "LAN Access ");
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if ( discovery->data.hints[1] & HINT_TELEPHONY)
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seq_puts(seq, "Telephony ");
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if ( discovery->data.hints[1] & HINT_FILE_SERVER)
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seq_puts(seq, "File Server ");
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if ( discovery->data.hints[1] & HINT_COMM)
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seq_puts(seq, "IrCOMM ");
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if ( discovery->data.hints[1] & HINT_OBEX)
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seq_puts(seq, "IrOBEX ");
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#endif
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seq_printf(seq,", saddr: 0x%08x, daddr: 0x%08x\n\n",
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discovery->data.saddr,
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discovery->data.daddr);
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seq_putc(seq, '\n');
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}
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return 0;
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}
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static struct seq_operations discovery_seq_ops = {
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.start = discovery_seq_start,
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.next = discovery_seq_next,
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.stop = discovery_seq_stop,
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.show = discovery_seq_show,
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};
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static int discovery_seq_open(struct inode *inode, struct file *file)
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{
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IRDA_ASSERT(irlmp != NULL, return -EINVAL;);
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return seq_open(file, &discovery_seq_ops);
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}
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struct file_operations discovery_seq_fops = {
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.owner = THIS_MODULE,
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.open = discovery_seq_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = seq_release,
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};
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#endif
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