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block: don't depend on consecutive minor space

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* Implement disk_devt() and part_devt() and use them to directly
  access devt instead of computing it from ->major and ->first_minor.

  Note that all references to ->major and ->first_minor outside of
  block layer is used to determine devt of the disk (the part0) and as
  ->major and ->first_minor will continue to represent devt for the
  disk, converting these users aren't strictly necessary.  However,
  convert them for consistency.

* Implement disk_max_parts() to avoid directly deferencing
  genhd->minors.

* Update bdget_disk() such that it doesn't assume consecutive minor
  space.

* Move devt computation from register_disk() to add_disk() and make it
  the only one (all other usages use the initially determined value).

These changes clean up the code and will help disk->part dereference
fix and extended block device numbers.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Tejun Heo
2008-09-03 09:01:48 +02:00
committed by Jens Axboe
parent cf771cb5a7
commit f331c0296f
16 changed files with 132 additions and 67 deletions
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2
fs/block_dev.c
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@@ -892,7 +892,7 @@ int check_disk_change(struct block_device *bdev)
if (bdops->revalidate_disk)
bdops->revalidate_disk(bdev->bd_disk);
if (bdev->bd_disk->minors > 1)
if (disk_max_parts(bdev->bd_disk))
bdev->bd_invalidated = 1;
return 1;
}