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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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19
fs/partitions/check.c
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@@ -134,7 +134,11 @@ char *disk_name(struct gendisk *hd, int partno, char *buf)
const char *bdevname(struct block_device *bdev, char *buf)
{
int partno = MINOR(bdev->bd_dev) - bdev->bd_disk->first_minor;
int partno = 0;
if (bdev->bd_part)
partno = bdev->bd_part->partno;
return disk_name(bdev->bd_disk, partno, buf);
}
@@ -169,7 +173,7 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
if (isdigit(state->name[strlen(state->name)-1]))
sprintf(state->name, "p");
state->limit = hd->minors;
state->limit = disk_max_parts(hd) + 1;
i = res = err = 0;
while (!res && check_part[i]) {
memset(&state->parts, 0, sizeof(state->parts));
@@ -416,7 +420,6 @@ void register_disk(struct gendisk *disk)
int err;
disk->dev.parent = disk->driverfs_dev;
disk->dev.devt = MKDEV(disk->major, disk->first_minor);
strlcpy(disk->dev.bus_id, disk->disk_name, BUS_ID_SIZE);
/* ewww... some of these buggers have / in the name... */
@@ -440,7 +443,7 @@ void register_disk(struct gendisk *disk)
disk_sysfs_add_subdirs(disk);
/* No minors to use for partitions */
if (disk->minors == 1)
if (!disk_max_parts(disk))
goto exit;
/* No such device (e.g., media were just removed) */
@@ -463,8 +466,8 @@ exit:
kobject_uevent(&disk->dev.kobj, KOBJ_ADD);
/* announce possible partitions */
for (i = 1; i < disk->minors; i++) {
p = disk->part[i-1];
for (i = 0; i < disk_max_parts(disk); i++) {
p = disk->part[i];
if (!p || !p->nr_sects)
continue;
kobject_uevent(&p->dev.kobj, KOBJ_ADD);
@@ -482,7 +485,7 @@ int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
if (res)
return res;
bdev->bd_invalidated = 0;
for (p = 1; p < disk->minors; p++)
for (p = 1; p <= disk_max_parts(disk); p++)
delete_partition(disk, p);
if (disk->fops->revalidate_disk)
disk->fops->revalidate_disk(disk);
@@ -545,7 +548,7 @@ void del_gendisk(struct gendisk *disk)
int p;
/* invalidate stuff */
for (p = disk->minors - 1; p > 0; p--) {
for (p = disk_max_parts(disk); p > 0; p--) {
invalidate_partition(disk, p);
delete_partition(disk, p);
}