tests/bug_expopt.c

   1 static int __init xpram_setup_blkdev(void)
   2 {
   3         unsigned long offset;
   4         int i, rc = -ENOMEM;
   5
   6         for (i = 0; i < xpram_devs; i++) {
   7                 struct gendisk *disk = alloc_disk(1);
   8                 if (!disk)
   9                         goto out;
  10                 xpram_disks[i] = disk;
  11         }
  12
  13         /*
  14          * Register xpram major.
  15          */
  16         rc = register_blkdev(XPRAM_MAJOR, XPRAM_NAME);
  17         if (rc < 0)
  18                 goto out;
  19
  20         devfs_mk_dir("slram");
  21
  22         /*
  23          * Assign the other needed values: make request function, sizes and
  24          * hardsect size. All the minor devices feature the same value.
  25          */
  26         xpram_queue = blk_alloc_queue(GFP_KERNEL);
  27         if (!xpram_queue) {
  28                 rc = -ENOMEM;
  29                 goto out_unreg;
  30         }
  31         blk_queue_make_request(xpram_queue, xpram_make_request);
  32         blk_queue_hardsect_size(xpram_queue, 4096);
  33
  34         /*
  35          * Setup device structures.
  36          */
  37         offset = 0;
  38         for (i = 0; i < xpram_devs; i++) {
  39                 struct gendisk *disk = xpram_disks[i];
  40
  41                 xpram_devices[i].size = xpram_sizes[i] / 4;
  42                 xpram_devices[i].offset = offset;
  43                 offset += xpram_devices[i].size;
  44                 disk->major = XPRAM_MAJOR;
  45                 disk->first_minor = i;
  46                 disk->fops = &xpram_devops;
  47                 disk->private_data = &xpram_devices[i];
  48                 disk->queue = xpram_queue;
  49                 sprintf(disk->disk_name, "slram%d", i);
  50                 sprintf(disk->devfs_name, "slram/%d", i);
  51                 set_capacity(disk, xpram_sizes[i] << 1);
  52                 add_disk(disk);
  53         }
  54
  55         return 0;
  56 out_unreg:
  57         devfs_remove("slram");
  58         unregister_blkdev(XPRAM_MAJOR, XPRAM_NAME);
  59 out:
  60         while (i--)
  61                 put_disk(xpram_disks[i]);
  62         return rc;
  63 }