Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 419 insertions, 0 deletions

diff --git a/net/irda/discovery.c b/net/irda/discovery.c
new file mode 100644
index 000000000000..c4ba5fa1446a
--- /dev/null
+++ b/net/irda/discovery.c
@@ -0,0 +1,419 @@
+/*********************************************************************
+ *                
+ * Filename:      discovery.c
+ * Version:       0.1
+ * Description:   Routines for handling discoveries at the IrLMP layer
+ * Status:        Experimental.
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Tue Apr  6 15:33:50 1999
+ * Modified at:   Sat Oct  9 17:11:31 1999
+ * Modified by:   Dag Brattli <dagb@cs.uit.no>
+ * Modified at:   Fri May 28  3:11 CST 1999
+ * Modified by:   Horst von Brand <vonbrand@sleipnir.valparaiso.cl>
+ * 
+ *     Copyright (c) 1999 Dag Brattli, All Rights Reserved.
+ *     
+ *     This program is free software; you can redistribute it and/or 
+ *     modify it under the terms of the GNU General Public License as 
+ *     published by the Free Software Foundation; either version 2 of 
+ *     the License, or (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License 
+ *     along with this program; if not, write to the Free Software 
+ *     Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
+ *     MA 02111-1307 USA
+ *     
+ ********************************************************************/
+
+#include <linux/string.h>
+#include <linux/socket.h>
+#include <linux/seq_file.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irlmp.h>
+
+#include <net/irda/discovery.h>
+
+/*
+ * Function irlmp_add_discovery (cachelog, discovery)
+ *
+ *    Add a new discovery to the cachelog, and remove any old discoveries
+ *    from the same device
+ *
+ * Note : we try to preserve the time this device was *first* discovered
+ * (as opposed to the time of last discovery used for cleanup). This is
+ * used by clients waiting for discovery events to tell if the device
+ * discovered is "new" or just the same old one. They can't rely there
+ * on a binary flag (new/old), because not all discovery events are
+ * propagated to them, and they might not always listen, so they would
+ * miss some new devices popping up...
+ * Jean II
+ */
+void irlmp_add_discovery(hashbin_t *cachelog, discovery_t *new)
+{
+        discovery_t *discovery, *node;
+        unsigned long flags;
+
+        /* Set time of first discovery if node is new (see below) */
+        new->firststamp = new->timestamp;
+
+        spin_lock_irqsave(&cachelog->hb_spinlock, flags);
+
+        /* 
+         * Remove all discoveries of devices that has previously been 
+         * discovered on the same link with the same name (info), or the 
+         * same daddr. We do this since some devices (mostly PDAs) change
+         * their device address between every discovery.
+         */
+        discovery = (discovery_t *) hashbin_get_first(cachelog);
+        while (discovery != NULL ) {
+                node = discovery;
+
+                /* Be sure to stay one item ahead */
+                discovery = (discovery_t *) hashbin_get_next(cachelog);
+
+                if ((node->data.saddr == new->data.saddr) &&
+                    ((node->data.daddr == new->data.daddr) || 
+                     (strcmp(node->data.info, new->data.info) == 0)))
+                {
+                        /* This discovery is a previous discovery 
+                         * from the same device, so just remove it
+                         */
+                        hashbin_remove_this(cachelog, (irda_queue_t *) node);
+                        /* Check if hints bits are unchanged */
+                        if(u16ho(node->data.hints) == u16ho(new->data.hints))
+                                /* Set time of first discovery for this node */
+                                new->firststamp = node->firststamp;
+                        kfree(node);
+                }
+        }
+
+        /* Insert the new and updated version */
+        hashbin_insert(cachelog, (irda_queue_t *) new, new->data.daddr, NULL);
+
+        spin_unlock_irqrestore(&cachelog->hb_spinlock, flags);
+}
+
+/*
+ * Function irlmp_add_discovery_log (cachelog, log)
+ *
+ *    Merge a disovery log into the cachelog.
+ *
+ */
+void irlmp_add_discovery_log(hashbin_t *cachelog, hashbin_t *log)
+{
+        discovery_t *discovery;
+
+        IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
+
+        /*
+         *  If log is missing this means that IrLAP was unable to perform the
+         *  discovery, so restart discovery again with just the half timeout
+         *  of the normal one.
+         */
+        /* Well... It means that there was nobody out there - Jean II */
+        if (log == NULL) {
+                /* irlmp_start_discovery_timer(irlmp, 150); */
+                return;
+        }
+
+        /*
+         * Locking : we are the only owner of this discovery log, so
+         * no need to lock it.
+         * We just need to lock the global log in irlmp_add_discovery().
+         */
+        discovery = (discovery_t *) hashbin_remove_first(log);
+        while (discovery != NULL) {
+                irlmp_add_discovery(cachelog, discovery);
+
+                discovery = (discovery_t *) hashbin_remove_first(log);
+        }
+        
+        /* Delete the now empty log */
+        hashbin_delete(log, (FREE_FUNC) kfree);
+}
+
+/*
+ * Function irlmp_expire_discoveries (log, saddr, force)
+ *
+ *    Go through all discoveries and expire all that has stayed too long
+ *
+ * Note : this assume that IrLAP won't change its saddr, which
+ * currently is a valid assumption...
+ */
+void irlmp_expire_discoveries(hashbin_t *log, __u32 saddr, int force)
+{
+        discovery_t *           discovery;
+        discovery_t *           curr;
+        unsigned long           flags;
+        discinfo_t *            buffer = NULL;
+        int                     n;              /* Size of the full log */
+        int                     i = 0;          /* How many we expired */
+
+        IRDA_ASSERT(log != NULL, return;);
+        IRDA_DEBUG(4, "%s()\n", __FUNCTION__);
+
+        spin_lock_irqsave(&log->hb_spinlock, flags);
+
+        discovery = (discovery_t *) hashbin_get_first(log);
+        while (discovery != NULL) {
+                /* Be sure to be one item ahead */
+                curr = discovery;
+                discovery = (discovery_t *) hashbin_get_next(log);
+
+                /* Test if it's time to expire this discovery */
+                if ((curr->data.saddr == saddr) &&
+                    (force ||
+                     ((jiffies - curr->timestamp) > DISCOVERY_EXPIRE_TIMEOUT)))
+                {
+                        /* Create buffer as needed.
+                         * As this function get called a lot and most time
+                         * we don't have anything to put in the log (we are
+                         * quite picky), we can save a lot of overhead
+                         * by not calling kmalloc. Jean II */
+                        if(buffer == NULL) {
+                                /* Create the client specific buffer */
+                                n = HASHBIN_GET_SIZE(log);
+                                buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
+                                if (buffer == NULL) {
+                                        spin_unlock_irqrestore(&log->hb_spinlock, flags);
+                                        return;
+                                }
+
+                        }
+
+                        /* Copy discovery information */
+                        memcpy(&(buffer[i]), &(curr->data),
+                               sizeof(discinfo_t));
+                        i++;
+
+                        /* Remove it from the log */
+                        curr = hashbin_remove_this(log, (irda_queue_t *) curr);
+                        if (curr)
+                                kfree(curr);
+                }
+        }
+
+        /* Drop the spinlock before calling the higher layers, as
+         * we can't guarantee they won't call us back and create a
+         * deadlock. We will work on our own private data, so we
+         * don't care to be interupted. - Jean II */
+        spin_unlock_irqrestore(&log->hb_spinlock, flags);
+
+        if(buffer == NULL)
+                return;
+
+        /* Tell IrLMP and registered clients about it */
+        irlmp_discovery_expiry(buffer, i);
+
+        /* Free up our buffer */
+        kfree(buffer);
+}
+
+#if 0
+/*
+ * Function irlmp_dump_discoveries (log)
+ *
+ *    Print out all discoveries in log
+ *
+ */
+void irlmp_dump_discoveries(hashbin_t *log)
+{
+        discovery_t *discovery;
+
+        IRDA_ASSERT(log != NULL, return;);
+
+        discovery = (discovery_t *) hashbin_get_first(log);
+        while (discovery != NULL) {
+                IRDA_DEBUG(0, "Discovery:\n");
+                IRDA_DEBUG(0, "  daddr=%08x\n", discovery->data.daddr);
+                IRDA_DEBUG(0, "  saddr=%08x\n", discovery->data.saddr); 
+                IRDA_DEBUG(0, "  nickname=%s\n", discovery->data.info);
+
+                discovery = (discovery_t *) hashbin_get_next(log);
+        }
+}
+#endif
+
+/*
+ * Function irlmp_copy_discoveries (log, pn, mask)
+ *
+ *    Copy all discoveries in a buffer
+ *
+ * This function implement a safe way for lmp clients to access the
+ * discovery log. The basic problem is that we don't want the log
+ * to change (add/remove) while the client is reading it. If the
+ * lmp client manipulate directly the hashbin, he is sure to get
+ * into troubles...
+ * The idea is that we copy all the current discovery log in a buffer
+ * which is specific to the client and pass this copy to him. As we
+ * do this operation with the spinlock grabbed, we are safe...
+ * Note : we don't want those clients to grab the spinlock, because
+ * we have no control on how long they will hold it...
+ * Note : we choose to copy the log in "struct irda_device_info" to
+ * save space...
+ * Note : the client must kfree himself() the log...
+ * Jean II
+ */
+struct irda_device_info *irlmp_copy_discoveries(hashbin_t *log, int *pn,
+                                                __u16 mask, int old_entries)
+{
+        discovery_t *           discovery;
+        unsigned long           flags;
+        discinfo_t *            buffer = NULL;
+        int                     j_timeout = (sysctl_discovery_timeout * HZ);
+        int                     n;              /* Size of the full log */
+        int                     i = 0;          /* How many we picked */
+
+        IRDA_ASSERT(pn != NULL, return NULL;);
+        IRDA_ASSERT(log != NULL, return NULL;);
+
+        /* Save spin lock */
+        spin_lock_irqsave(&log->hb_spinlock, flags);
+
+        discovery = (discovery_t *) hashbin_get_first(log);
+        while (discovery != NULL) {
+                /* Mask out the ones we don't want :
+                 * We want to match the discovery mask, and to get only
+                 * the most recent one (unless we want old ones) */
+                if ((u16ho(discovery->data.hints) & mask) &&
+                    ((old_entries) ||
+                     ((jiffies - discovery->firststamp) < j_timeout)) ) {
+                        /* Create buffer as needed.
+                         * As this function get called a lot and most time
+                         * we don't have anything to put in the log (we are
+                         * quite picky), we can save a lot of overhead
+                         * by not calling kmalloc. Jean II */
+                        if(buffer == NULL) {
+                                /* Create the client specific buffer */
+                                n = HASHBIN_GET_SIZE(log);
+                                buffer = kmalloc(n * sizeof(struct irda_device_info), GFP_ATOMIC);
+                                if (buffer == NULL) {
+                                        spin_unlock_irqrestore(&log->hb_spinlock, flags);
+                                        return NULL;
+                                }
+
+                        }
+
+                        /* Copy discovery information */
+                        memcpy(&(buffer[i]), &(discovery->data),
+                               sizeof(discinfo_t));
+                        i++;
+                }
+                discovery = (discovery_t *) hashbin_get_next(log);
+        }
+
+        spin_unlock_irqrestore(&log->hb_spinlock, flags);
+
+        /* Get the actual number of device in the buffer and return */
+        *pn = i;
+        return(buffer);
+}
+
+#ifdef CONFIG_PROC_FS
+static inline discovery_t *discovery_seq_idx(loff_t pos)
+
+{
+        discovery_t *discovery;
+
+        for (discovery = (discovery_t *) hashbin_get_first(irlmp->cachelog); 
+             discovery != NULL;
+             discovery = (discovery_t *) hashbin_get_next(irlmp->cachelog)) {
+                if (pos-- == 0)
+                        break;
+        }
+                
+        return discovery;
+}
+
+static void *discovery_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        spin_lock_irq(&irlmp->cachelog->hb_spinlock);
+        return *pos ? discovery_seq_idx(*pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *discovery_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        ++*pos;
+        return (v == SEQ_START_TOKEN) 
+                ? (void *) hashbin_get_first(irlmp->cachelog)
+                : (void *) hashbin_get_next(irlmp->cachelog);
+}
+
+static void discovery_seq_stop(struct seq_file *seq, void *v)
+{
+        spin_unlock_irq(&irlmp->cachelog->hb_spinlock);
+}
+
+static int discovery_seq_show(struct seq_file *seq, void *v)
+{
+        if (v == SEQ_START_TOKEN)
+                seq_puts(seq, "IrLMP: Discovery log:\n\n");
+        else {
+                const discovery_t *discovery = v;
+
+                seq_printf(seq, "nickname: %s, hint: 0x%02x%02x", 
+                           discovery->data.info,
+                           discovery->data.hints[0], 
+                           discovery->data.hints[1]);
+#if 0
+                if ( discovery->data.hints[0] & HINT_PNP)
+                        seq_puts(seq, "PnP Compatible ");
+                if ( discovery->data.hints[0] & HINT_PDA)
+                        seq_puts(seq, "PDA/Palmtop ");
+                if ( discovery->data.hints[0] & HINT_COMPUTER)
+                        seq_puts(seq, "Computer ");
+                if ( discovery->data.hints[0] & HINT_PRINTER)
+                        seq_puts(seq, "Printer ");
+                if ( discovery->data.hints[0] & HINT_MODEM)
+                        seq_puts(seq, "Modem ");
+                if ( discovery->data.hints[0] & HINT_FAX)
+                        seq_puts(seq, "Fax ");
+                if ( discovery->data.hints[0] & HINT_LAN)
+                        seq_puts(seq, "LAN Access ");
+                
+                if ( discovery->data.hints[1] & HINT_TELEPHONY)
+                        seq_puts(seq, "Telephony ");
+                if ( discovery->data.hints[1] & HINT_FILE_SERVER)
+                        seq_puts(seq, "File Server ");       
+                if ( discovery->data.hints[1] & HINT_COMM)
+                        seq_puts(seq, "IrCOMM ");
+                if ( discovery->data.hints[1] & HINT_OBEX)
+                        seq_puts(seq, "IrOBEX ");
+#endif          
+                seq_printf(seq,", saddr: 0x%08x, daddr: 0x%08x\n\n",
+                               discovery->data.saddr,
+                               discovery->data.daddr);
+                
+                seq_putc(seq, '\n');
+        }
+        return 0;
+}
+
+static struct seq_operations discovery_seq_ops = {
+        .start  = discovery_seq_start,
+        .next   = discovery_seq_next,
+        .stop   = discovery_seq_stop,
+        .show   = discovery_seq_show,
+};
+
+static int discovery_seq_open(struct inode *inode, struct file *file)
+{
+        IRDA_ASSERT(irlmp != NULL, return -EINVAL;);
+
+        return seq_open(file, &discovery_seq_ops);
+}
+
+struct file_operations discovery_seq_fops = {
+        .owner          = THIS_MODULE,
+        .open           = discovery_seq_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+#endif