path: root/block/ioctl.c
diff options
authorTejun Heo <tj@kernel.org>2008-09-03 09:01:48 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-10-09 08:56:05 +0200
commitf331c0296f2a9fee0d396a70598b954062603015 (patch)
treef74c467d58940131d97d90c4ea549843185e6ef0 /block/ioctl.c
parentcf771cb5a7b716f3f9e532fd42a1e3a0a75adec5 (diff)
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>
Diffstat (limited to 'block/ioctl.c')
1 files changed, 3 insertions, 3 deletions
diff --git a/block/ioctl.c b/block/ioctl.c
index d77f5e280a6..403f7d7e0c2 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -29,7 +29,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
if (bdev != bdev->bd_contains)
return -EINVAL;
partno = p.pno;
- if (partno <= 0 || partno >= disk->minors)
+ if (partno <= 0 || partno > disk_max_parts(disk))
return -EINVAL;
switch (a.op) {
@@ -47,7 +47,7 @@ static int blkpg_ioctl(struct block_device *bdev, struct blkpg_ioctl_arg __user
/* overlap? */
- for (i = 0; i < disk->minors - 1; i++) {
+ for (i = 0; i < disk_max_parts(disk); i++) {
struct hd_struct *s = disk->part[i];
if (!s)
@@ -96,7 +96,7 @@ static int blkdev_reread_part(struct block_device *bdev)
struct gendisk *disk = bdev->bd_disk;
int res;
- if (disk->minors == 1 || bdev != bdev->bd_contains)
+ if (!disk_max_parts(disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;