drivers/block/aoe/aoemain.c

   1 /* Copyright (c) 2007 Coraid, Inc.  See COPYING for GPL terms. */
   2 /*
   3  * aoemain.c
   4  * Module initialization routines, discover timer
   5  */
   6
   7 #include <linux/hdreg.h>
   8 #include <linux/blkdev.h>
   9 #include <linux/module.h>
  10 #include "aoe.h"
  11
  12 MODULE_LICENSE("GPL");
  13 MODULE_AUTHOR("Sam Hopkins <sah@coraid.com>");
  14 MODULE_DESCRIPTION("AoE block/char driver for 2.6.2 and newer 2.6 kernels");
  15 MODULE_VERSION(VERSION);
  16
  17 enum { TINIT, TRUN, TKILL };
  18
  19 static void
  20 discover_timer(ulong vp)
  21 {
  22         static struct timer_list t;
  23         static volatile ulong die;
  24         static spinlock_t lock;
  25         ulong flags;
  26         enum { DTIMERTICK = HZ * 60 }; /* one minute */
  27
  28         switch (vp) {
  29         case TINIT:
  30                 init_timer(&t);
  31                 spin_lock_init(&lock);
  32                 t.data = TRUN;
  33                 t.function = discover_timer;
  34                 die = 0;
  35         case TRUN:
  36                 spin_lock_irqsave(&lock, flags);
  37                 if (!die) {
  38                         t.expires = jiffies + DTIMERTICK;
  39                         add_timer(&t);
  40                 }
  41                 spin_unlock_irqrestore(&lock, flags);
  42
  43                 aoecmd_cfg(0xffff, 0xff);
  44                 return;
  45         case TKILL:
  46                 spin_lock_irqsave(&lock, flags);
  47                 die = 1;
  48                 spin_unlock_irqrestore(&lock, flags);
  49
  50                 del_timer_sync(&t);
  51         default:
  52                 return;
  53         }
  54 }
  55
  56 static void
  57 aoe_exit(void)
  58 {
  59         discover_timer(TKILL);
  60
  61         aoenet_exit();
  62         unregister_blkdev(AOE_MAJOR, DEVICE_NAME);
  63         aoechr_exit();
  64         aoedev_exit();
  65         aoeblk_exit();          /* free cache after de-allocating bufs */
  66 }
  67
  68 static int __init
  69 aoe_init(void)
  70 {
  71         int ret;
  72
  73         ret = aoedev_init();
  74         if (ret)
  75                 return ret;
  76         ret = aoechr_init();
  77         if (ret)
  78                 goto chr_fail;
  79         ret = aoeblk_init();
  80         if (ret)
  81                 goto blk_fail;
  82         ret = aoenet_init();
  83         if (ret)
  84                 goto net_fail;
  85         ret = register_blkdev(AOE_MAJOR, DEVICE_NAME);
  86         if (ret < 0) {
  87                 printk(KERN_ERR "aoe: can't register major\n");
  88                 goto blkreg_fail;
  89         }
  90
  91         printk(KERN_INFO "aoe: AoE v%s initialised.\n", VERSION);
  92         discover_timer(TINIT);
  93         return 0;
  94
  95  blkreg_fail:
  96         aoenet_exit();
  97  net_fail:
  98         aoeblk_exit();
  99  blk_fail:
 100         aoechr_exit();
 101  chr_fail:
 102         aoedev_exit();
 103
 104         printk(KERN_INFO "aoe: initialisation failure.\n");
 105         return ret;
 106 }
 107
 108 module_init(aoe_init);
 109 module_exit(aoe_exit);
 110