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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 /drivers/md/dm-ioctl.c
parentcf771cb5a7b716f3f9e532fd42a1e3a0a75adec5 (diff)
downloadop-kernel-dev-f331c0296f2a9fee0d396a70598b954062603015.zip
op-kernel-dev-f331c0296f2a9fee0d396a70598b954062603015.tar.gz
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 'drivers/md/dm-ioctl.c')
-rw-r--r--drivers/md/dm-ioctl.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index b262c00..c3de311 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -426,7 +426,7 @@ static int list_devices(struct dm_ioctl *param, size_t param_size)
old_nl->next = (uint32_t) ((void *) nl -
(void *) old_nl);
disk = dm_disk(hc->md);
- nl->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor));
+ nl->dev = huge_encode_dev(disk_devt(disk));
nl->next = 0;
strcpy(nl->name, hc->name);
@@ -539,7 +539,7 @@ static int __dev_status(struct mapped_device *md, struct dm_ioctl *param)
if (dm_suspended(md))
param->flags |= DM_SUSPEND_FLAG;
- param->dev = huge_encode_dev(MKDEV(disk->major, disk->first_minor));
+ param->dev = huge_encode_dev(disk_devt(disk));
/*
* Yes, this will be out of date by the time it gets back
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