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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/s390/block
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/s390/block')
-rw-r--r--drivers/s390/block/dasd_proc.c3
-rw-r--r--drivers/s390/block/dcssblk.c4
2 files changed, 4 insertions, 3 deletions
diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c
index 03c0e40..e3b5c4d 100644
--- a/drivers/s390/block/dasd_proc.c
+++ b/drivers/s390/block/dasd_proc.c
@@ -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. */
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 711b300..9481e4a 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -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)) {
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