block: don't depend on consecutive minor space
* 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>
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index b86aab1..e77fa14 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -134,7 +134,11 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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);
}