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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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Tejun Heo 2008-09-03 09:01:48 +02:00 • committed by Jens Axboe
commit f331c0296f
16 changed files with 132 additions and 67 deletions
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3
drivers/s390/block/dasd_proc.c
View file

@ -76,7 +76,8 @@ dasd_devices_show(struct seq_file *m, void *v)
/* Print kdev. */
if (block->gdp)
seq_printf(m, " at (%3d:%6d)",
block->gdp->major, block->gdp->first_minor);
MAJOR(disk_devt(block->gdp)),
MINOR(disk_devt(block->gdp)));
else
seq_printf(m, " at (???:??????)");
/* Print device name. */

4
drivers/s390/block/dcssblk.c
View file

@ -114,7 +114,7 @@ dcssblk_assign_free_minor(struct dcssblk_dev_info *dev_info)
found = 0;
// test if minor available
list_for_each_entry(entry, &dcssblk_devices, lh)
if (minor == entry->gd->first_minor)
if (minor == MINOR(disk_devt(entry->gd)))
found++;
if (!found) break; // got unused minor
}
@ -397,7 +397,7 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
goto unload_seg;
}
sprintf(dev_info->gd->disk_name, "dcssblk%d",
dev_info->gd->first_minor);
MINOR(disk_devt(dev_info->gd)));
list_add_tail(&dev_info->lh, &dcssblk_devices);
if (!try_module_get(THIS_MODULE)) {