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aoemain.c

/* Copyright (c) 2006 Coraid, Inc.  See COPYING for GPL terms. */
/*
 * aoemain.c
 * Module initialization routines, discover timer
 */

#include <linux/hdreg.h>
#include <linux/blkdev.h>
#include <linux/module.h>
#include "aoe.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Sam Hopkins <sah@coraid.com>");
MODULE_DESCRIPTION("AoE block/char driver for 2.6.2 and newer 2.6 kernels");
MODULE_VERSION(VERSION);

enum { TINIT, TRUN, TKILL };

static void
discover_timer(ulong vp)
{
      static struct timer_list t;
      static volatile ulong die;
      static spinlock_t lock;
      ulong flags;
      enum { DTIMERTICK = HZ * 60 }; /* one minute */

      switch (vp) {
      case TINIT:
            init_timer(&t);
            spin_lock_init(&lock);
            t.data = TRUN;
            t.function = discover_timer;
            die = 0;
      case TRUN:
            spin_lock_irqsave(&lock, flags);
            if (!die) {
                  t.expires = jiffies + DTIMERTICK;
                  add_timer(&t);
            }
            spin_unlock_irqrestore(&lock, flags);

            aoecmd_cfg(0xffff, 0xff);
            return;
      case TKILL:
            spin_lock_irqsave(&lock, flags);
            die = 1;
            spin_unlock_irqrestore(&lock, flags);

            del_timer_sync(&t);
      default:
            return;
      }
}

static void
aoe_exit(void)
{
      discover_timer(TKILL);

      aoenet_exit();
      unregister_blkdev(AOE_MAJOR, DEVICE_NAME);
      aoechr_exit();
      aoedev_exit();
      aoeblk_exit();          /* free cache after de-allocating bufs */
}

static int __init
aoe_init(void)
{
      int ret;

      ret = aoedev_init();
      if (ret)
            return ret;
      ret = aoechr_init();
      if (ret)
            goto chr_fail;
      ret = aoeblk_init();
      if (ret)
            goto blk_fail;
      ret = aoenet_init();
      if (ret)
            goto net_fail;
      ret = register_blkdev(AOE_MAJOR, DEVICE_NAME);
      if (ret < 0) {
            printk(KERN_ERR "aoe: can't register major\n");
            goto blkreg_fail;
      }

      printk(KERN_INFO "aoe: AoE v%s initialised.\n", VERSION);
      discover_timer(TINIT);
      return 0;

 blkreg_fail:
      aoenet_exit();
 net_fail:
      aoeblk_exit();
 blk_fail:
      aoechr_exit();
 chr_fail:
      aoedev_exit();
      
      printk(KERN_INFO "aoe: initialisation failure.\n");
      return ret;
}

module_init(aoe_init);
module_exit(aoe_exit);


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